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Pavel Holoborodko | Applied mathematics and beyond

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id="branding"><div id="blog-title"><span><a href="http://www.holoborodko.com/pavel/" title="Pavel Holoborodko" rel="home">Pavel Holoborodko</a></span></div><h1 id="blog-description">Applied mathematics and beyond</h1></div><div id="access"><div class="skip-link"><a href="#content" title="Skip navigation to the content">Skip to content</a></div><div class="menu"><ul id="nav" class="sf-menu"><li class="current_page_item"><a href="http://www.holoborodko.com/pavel/">Home</a></li><li class="page_item page-item-12"><a href="http://www.holoborodko.com/pavel/mpfr/">MPFR C++</a></li><li class="page_item page-item-1413 page_item_has_children"><a href="http://www.holoborodko.com/pavel/numerical-methods/">Numerical Methods</a><ul class='children'><li class="page_item page-item-236 page_item_has_children"><a href="http://www.holoborodko.com/pavel/numerical-methods/numerical-derivative/">Numerical Differentiation</a><ul class='children'><li class="page_item page-item-239"><a href="http://www.holoborodko.com/pavel/numerical-methods/numerical-derivative/central-differences/">Central Differences</a></li><li class="page_item page-item-242"><a href="http://www.holoborodko.com/pavel/numerical-methods/numerical-derivative/lanczos-low-noise-differentiators/">Low-noise Lanczos differentiators</a></li><li class="page_item page-item-245"><a href="http://www.holoborodko.com/pavel/numerical-methods/numerical-derivative/smooth-low-noise-differentiators/">Smooth noise-robust differentiators</a></li></ul></li><li class="page_item page-item-679 page_item_has_children"><a href="http://www.holoborodko.com/pavel/numerical-methods/numerical-integration/">Numerical Integration</a><ul class='children'><li class="page_item page-item-1879"><a href="http://www.holoborodko.com/pavel/numerical-methods/numerical-integration/cubature-formulas-for-the-unit-disk/">Cubature formulas for the unit disk</a></li><li class="page_item page-item-2801"><a href="http://www.holoborodko.com/pavel/numerical-methods/numerical-integration/stable-newton-cotes-formulas/">Stable Newton-Cotes Formulas</a></li><li class="page_item page-item-2822"><a href="http://www.holoborodko.com/pavel/numerical-methods/numerical-integration/overlapped-newton-cotes-quadratures/">Overlapped Newton-Cotes Quadratures</a></li><li class="page_item page-item-3678"><a href="http://www.holoborodko.com/pavel/numerical-methods/numerical-integration/stable-newton-cotes-formulas-open-type/">Stable Newton-Cotes Formulas (Open Type)</a></li></ul></li><li class="page_item page-item-3645"><a href="http://www.holoborodko.com/pavel/numerical-methods/noise-robust-smoothing-filter/">Noise-robust smoothing filter</a></li></ul></li><li class="page_item page-item-1422 page_item_has_children"><a href="http://www.holoborodko.com/pavel/quicklatex/">QuickLaTeX</a><ul class='children'><li class="page_item page-item-3759"><a 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slug-generating-equidistant-points-on-unit-disk"><h2 class="entry-title"><a href="http://www.holoborodko.com/pavel/2015/07/23/generating-equidistant-points-on-unit-disk/" title="Permalink to Generating Equidistant Points on Unit Disk" rel="bookmark">Generating Equidistant Points on Unit Disk</a></h2><div class="entry-meta"><span class="entry-date"><abbr class="published" title="2015-07-23T14:48:53+0900">July 23, 2015</abbr></span></div><div class="entry-content"><p>Recently I needed an algorithm to generate equidistant points inside the unit disk with some of them placed on the boundary (circle). To my surprise, quick search didn&#8217;t reveal any simple method for this. Below is obvious solution &#038; code, hopefully it will save some time for others.</p><p>MATLAB code:</p><pre class="brush: matlabkey; title: ; notranslate" title=""> function [x, y, Nb, Np] = eqdisk(Nr) %EQDISK Generates equidistant points inside the unit disk. % Nr [in] - number of radial circles % x,y [out] - coordinates of generated points % Np [out] - total number of generated points % Nb [out] - points on boundary (on r = 1 circle) dR = 1/Nr; x(1) = 0; y(1) = 0; k = 1; for r = dR:dR:1 n = round(pi/asin(1/(2*k))); theta = linspace(0, 2*pi, n+1)'; x = [x; r.*cos(theta(1:n))]; y = [y; r.*sin(theta(1:n))]; k = k+1; end; Nb = n; Np = size(x,1); end </pre><p>Algorithm is based on the idea of placing the points on concentric circles with (near-) equal arc length between them. Here is some examples:</p><p> <a href="http://www.holoborodko.com/pavel/2015/07/23/generating-equidistant-points-on-unit-disk/#more-3453" class="more-link">Read More <span class="meta-nav">&raquo;</span></a></p></div><div class="entry-utility"><span class="cat-links">Posted in <a href="http://www.holoborodko.com/pavel/category/numeric-analysis/" rel="category tag">Numeric Analysis</a>, <a href="http://www.holoborodko.com/pavel/category/programming/" rel="category tag">Programming</a></span> <span class="meta-sep">|</span> <span class="comments-link"><a href="http://www.holoborodko.com/pavel/2015/07/23/generating-equidistant-points-on-unit-disk/#comments" title="Comment on Generating Equidistant Points on Unit Disk">1 Comment</a></span></div></div><div id="post-3389" class="hentry p2 post publish author-pavel-holoborodko category-finite-differences category-numeric-analysis category-numerical-derivative untagged y2014 m11 d05 h04 alt slug-computing-mixed-derivatives-by-finite-differences"><h2 class="entry-title"><a href="http://www.holoborodko.com/pavel/2014/11/04/computing-mixed-derivatives-by-finite-differences/" title="Permalink to Computing Mixed Derivatives by Finite Differences" rel="bookmark">Computing Mixed Derivatives by Finite Differences</a></h2><div class="entry-meta"><span class="entry-date"><abbr class="published" title="2014-11-04T19:02:02+0900">November 4, 2014</abbr></span></div><div class="entry-content"><p>The post is aimed to summarize various finite difference schemes for partial derivatives estimation dispersed in comments on the <a href="http://www.holoborodko.com/pavel/numerical-methods/numerical-derivative/central-differences/" >Central Differences</a> page. To gather them all in one place as a reference.</p><p>Listed formulas are selected as being advantageous among others of similar class &#8211; highest order of approximation, low rounding errors, etc. Please use comments to add other schemes.</p><h2>Second order</h2><p><img src="http://www.holoborodko.com/pavel/wp-content/ql-cache/quicklatex.com-5e831e1f20e24d380ec17f6a1a3bfc2b_l3.png" class="ql-img-inline-formula quicklatex-auto-format" alt="&#79;&#40;&#104;&#94;&#50;&#41;" title="Rendered by QuickLaTeX.com" height="23" width="50" style="vertical-align: -5px;"/>:</p><p class="ql-center-displayed-equation" style="line-height: 50px;"><span class="ql-right-eqno"> (1) </span><span class="ql-left-eqno"> &nbsp; </span><img src="http://www.holoborodko.com/pavel/wp-content/ql-cache/quicklatex.com-dd155b7283e2bb7f9498c739ec943bf9_l3.png" height="50" width="369" class="ql-img-displayed-equation quicklatex-auto-format" alt="&#92;&#98;&#101;&#103;&#105;&#110;&#123;&#101;&#113;&#117;&#97;&#116;&#105;&#111;&#110;&#42;&#125; &#92;&#100;&#105;&#115;&#112;&#108;&#97;&#121;&#115;&#116;&#121;&#108;&#101;&#123;&#123;&#92;&#102;&#114;&#97;&#99;&#123;&#92;&#112;&#97;&#114;&#116;&#105;&#97;&#108;&#94;&#50;&#123;&#102;&#125;&#125;&#123;&#92;&#112;&#97;&#114;&#116;&#105;&#97;&#108;&#123;&#120;&#125;&#92;&#112;&#97;&#114;&#116;&#105;&#97;&#108;&#123;&#121;&#125;&#125;&#125;&#92;&#97;&#112;&#112;&#114;&#111;&#120; &#92;&#102;&#114;&#97;&#99;&#123;&#49;&#125;&#123;&#52;&#92;&#44;&#104;&#94;&#50;&#125;&#92;&#108;&#101;&#102;&#116;&#91;&#102;&#95;&#123;&#45;&#49;&#44;&#45;&#49;&#125;&#43;&#102;&#95;&#123;&#49;&#44;&#49;&#125;&#45;&#102;&#95;&#123;&#49;&#44;&#45;&#49;&#125;&#45;&#102;&#95;&#123;&#45;&#49;&#44;&#49;&#125;&#92;&#114;&#105;&#103;&#104;&#116;&#93;&#125; &#92;&#101;&#110;&#100;&#123;&#101;&#113;&#117;&#97;&#116;&#105;&#111;&#110;&#42;&#125;" title="Rendered by QuickLaTeX.com"/></p><p><img src="http://www.holoborodko.com/pavel/wp-content/ql-cache/quicklatex.com-e8c3be952db8b9baf29324277b763f87_l3.png" class="ql-img-inline-formula quicklatex-auto-format" alt="&#79;&#40;&#104;&#94;&#52;&#41;" title="Rendered by QuickLaTeX.com" height="23" width="50" style="vertical-align: -5px;"/>:</p><p class="ql-center-displayed-equation" style="line-height: 51px;"><span class="ql-right-eqno"> (2) </span><span class="ql-left-eqno"> &nbsp; </span><img src="http://www.holoborodko.com/pavel/wp-content/ql-cache/quicklatex.com-861614cdcf7992ed498096a0dd6018d6_l3.png" height="51" width="746" class="ql-img-displayed-equation quicklatex-auto-format" alt="&#92;&#98;&#101;&#103;&#105;&#110;&#123;&#101;&#113;&#117;&#97;&#116;&#105;&#111;&#110;&#42;&#125; &#92;&#102;&#114;&#97;&#99;&#123;&#92;&#112;&#97;&#114;&#116;&#105;&#97;&#108;&#94;&#50;&#32;&#102;&#125;&#123;&#92;&#112;&#97;&#114;&#116;&#105;&#97;&#108;&#32;&#120;&#32;&#92;&#112;&#97;&#114;&#116;&#105;&#97;&#108;&#32;&#121;&#125;&#32;&#92;&#97;&#112;&#112;&#114;&#111;&#120;&#32;&#92;&#102;&#114;&#97;&#99;&#123;&#49;&#125;&#123;&#49;&#52;&#52;&#32;&#104;&#94;&#50;&#125;&#92;&#108;&#101;&#102;&#116;&#91; &#32;&#32;&#92;&#98;&#101;&#103;&#105;&#110;&#123;&#97;&#114;&#114;&#97;&#121;&#125;&#123;&#108;&#125; &#32;&#32;&#32;&#32;&#56;&#40;&#102;&#95;&#123;&#49;&#44;&#45;&#50;&#125;&#43;&#102;&#95;&#123;&#50;&#44;&#45;&#49;&#125;&#43;&#102;&#95;&#123;&#45;&#50;&#44;&#49;&#125;&#43;&#102;&#95;&#123;&#45;&#49;&#44;&#50;&#125;&#41;&#45;&#56;&#40;&#102;&#95;&#123;&#45;&#49;&#44;&#45;&#50;&#125;&#43;&#102;&#95;&#123;&#45;&#50;&#44;&#45;&#49;&#125;&#43;&#102;&#95;&#123;&#49;&#44;&#50;&#125;&#43;&#102;&#95;&#123;&#50;&#44;&#49;&#125;&#41;&#92;&#92; &#32;&#32;&#32;&#45;&#40;&#102;&#95;&#123;&#50;&#44;&#45;&#50;&#125;&#43;&#102;&#95;&#123;&#45;&#50;&#44;&#50;&#125;&#45;&#102;&#95;&#123;&#45;&#50;&#44;&#45;&#50;&#125;&#45;&#102;&#95;&#123;&#50;&#44;&#50;&#125;&#41;&#43;&#54;&#52;&#40;&#102;&#95;&#123;&#45;&#49;&#44;&#45;&#49;&#125;&#43;&#102;&#95;&#123;&#49;&#44;&#49;&#125;&#45;&#102;&#95;&#123;&#49;&#44;&#45;&#49;&#125;&#45;&#102;&#95;&#123;&#45;&#49;&#44;&#49;&#125;&#41; &#32;&#32;&#92;&#101;&#110;&#100;&#123;&#97;&#114;&#114;&#97;&#121;&#125;&#92;&#114;&#105;&#103;&#104;&#116;&#93; &#92;&#101;&#110;&#100;&#123;&#101;&#113;&#117;&#97;&#116;&#105;&#111;&#110;&#42;&#125;" title="Rendered by QuickLaTeX.com"/></p><p> <a href="http://www.holoborodko.com/pavel/2014/11/04/computing-mixed-derivatives-by-finite-differences/#more-3389" class="more-link">Read More <span class="meta-nav">&raquo;</span></a></p></div><div class="entry-utility"><span class="cat-links">Posted in <a href="http://www.holoborodko.com/pavel/category/finite-differences/" rel="category tag">Finite Differences</a>, <a href="http://www.holoborodko.com/pavel/category/numeric-analysis/" rel="category tag">Numeric Analysis</a>, <a href="http://www.holoborodko.com/pavel/category/numeric-analysis/numerical-derivative/" rel="category tag">Numerical Derivative</a></span> <span class="meta-sep">|</span> <span class="comments-link"><a href="http://www.holoborodko.com/pavel/2014/11/04/computing-mixed-derivatives-by-finite-differences/#comments" title="Comment on Computing Mixed Derivatives by Finite Differences">1 Comment</a></span></div></div><div id="post-3370" class="hentry p3 post publish author-pavel-holoborodko category-filter-design category-numeric-analysis category-numerical-integration untagged y2014 m10 d22 h06 slug-sinc-function-and-gauss-legendre-quadrature"><h2 class="entry-title"><a href="http://www.holoborodko.com/pavel/2014/10/21/sinc-function-and-gauss-legendre-quadrature/" title="Permalink to Sinc Function and Gauss-Legendre quadrature" rel="bookmark">Sinc Function and Gauss-Legendre quadrature</a></h2><div class="entry-meta"><span class="entry-date"><abbr class="published" title="2014-10-21T21:15:05+0900">October 21, 2014</abbr></span></div><div class="entry-content"><p><em><br /> <strong>UPDATE: August 13, 2015.</strong><br /> Finally I was able to see the relation between the two. Gauss-Legendre quadrature is based on exactness on polynomials, which can be re-formulated in terms of frequency domain. As it turned out, this condition has very simple form:</p><p class="ql-center-displayed-equation" style="line-height: 62px;"><span class="ql-right-eqno"> &nbsp; </span><span class="ql-left-eqno"> &nbsp; </span><img src="http://www.holoborodko.com/pavel/wp-content/ql-cache/quicklatex.com-886f4bacd09d2c0a5e362d6879418062_l3.png" height="62" width="393" class="ql-img-displayed-equation quicklatex-auto-format" alt="&#92;&#91;&#32; &#92;&#102;&#114;&#97;&#99;&#123;&#100;&#94;&#110;&#125;&#123;&#100;&#92;&#111;&#109;&#101;&#103;&#97;&#94;&#110;&#125;&#32;&#72;&#40;&#92;&#111;&#109;&#101;&#103;&#97;&#41;&#32;&#92;&#66;&#105;&#103;&#103;&#114;&#124;&#95;&#123;&#92;&#111;&#109;&#101;&#103;&#97;&#61;&#48;&#125;&#61;&#32;&#50;&#92;&#44;&#92;&#102;&#114;&#97;&#99;&#123;&#100;&#94;&#110;&#125;&#123;&#100;&#92;&#111;&#109;&#101;&#103;&#97;&#94;&#110;&#125;&#32;&#92;&#116;&#101;&#120;&#116;&#123;&#115;&#105;&#110;&#99;&#125;&#40;&#92;&#111;&#109;&#101;&#103;&#97;&#41;&#32;&#92;&#66;&#105;&#103;&#103;&#114;&#124;&#95;&#123;&#92;&#111;&#109;&#101;&#103;&#97;&#61;&#48;&#125;&#61;&#92;&#102;&#114;&#97;&#99;&#123;&#50;&#92;&#44;&#40;&#45;&#49;&#41;&#94;&#123;&#110;&#125;&#125;&#123;&#110;&#43;&#49;&#125; &#92;&#93;" title="Rendered by QuickLaTeX.com"/></p><p>where <img src="http://www.holoborodko.com/pavel/wp-content/ql-cache/quicklatex.com-127cce503ff03682d2a8c9f1939b45b4_l3.png" class="ql-img-inline-formula quicklatex-auto-format" alt="&#110;&#61;&#48;&#44;&#50;&#44;&#52;&#44;&#92;&#100;&#111;&#116;&#115;&#44;&#50;&#107;" title="Rendered by QuickLaTeX.com" height="18" width="152" style="vertical-align: -4px;"/> is polynomial degree and <img src="http://www.holoborodko.com/pavel/wp-content/ql-cache/quicklatex.com-3489d07a46ab7bf54672c76d29795b00_l3.png" class="ql-img-inline-formula quicklatex-auto-format" alt="&#72;&#40;&#92;&#111;&#109;&#101;&#103;&#97;&#41;" title="Rendered by QuickLaTeX.com" height="20" width="45" style="vertical-align: -5px;"/> is frequency response of a quadrature rule.</p><p>This relation is very interesting as it allows us to build numerical integrators in frequency domain (see <a href="http://www.holoborodko.com/pavel/numerical-methods/numerical-derivative/smooth-low-noise-differentiators/" >differentiators </a>and <a href="http://www.holoborodko.com/pavel/numerical-methods/noise-robust-smoothing-filter/" >smoothers</a> for example).<br /> </em></p><p>How these two could possibly relate to each other? I had no idea, until I saw these two plots today:<br /> <img src="http://www.holoborodko.com/pavel/wp-content/uploads/sinc_gl.png" alt="sinc_gl" /><br /> Green curve is a frequency response of Gauss-Legendre quadrature of order <img src="http://www.holoborodko.com/pavel/wp-content/ql-cache/quicklatex.com-fa9e94893973d0d6a5ff49c3de9e865b_l3.png" class="ql-img-inline-formula quicklatex-auto-format" alt="&#78;&#61;&#49;&#53;" title="Rendered by QuickLaTeX.com" height="15" width="64" style="vertical-align: -1px;"/>, red &#8211; <img src="http://www.holoborodko.com/pavel/wp-content/ql-cache/quicklatex.com-6cfd7d9f97f3ded5dd4dbc723bfcb9f9_l3.png" class="ql-img-inline-formula quicklatex-auto-format" alt="&#78;&#61;&#50;&#53;" title="Rendered by QuickLaTeX.com" height="14" width="64" style="vertical-align: 0px;"/> and blue curve is the <img src="http://www.holoborodko.com/pavel/wp-content/ql-cache/quicklatex.com-9619c2d8a1608422a269ce2e8a93aa88_l3.png" class="ql-img-inline-formula quicklatex-auto-format" alt="&#92;&#109;&#97;&#116;&#104;&#114;&#109;&#123;&#115;&#105;&#110;&#99;&#125;&#40;&#92;&#111;&#109;&#101;&#103;&#97;&#41;" title="Rendered by QuickLaTeX.com" height="20" width="60" style="vertical-align: -5px;"/> function.</p><p> <a href="http://www.holoborodko.com/pavel/2014/10/21/sinc-function-and-gauss-legendre-quadrature/#more-3370" class="more-link">Read More <span class="meta-nav">&raquo;</span></a></p></div><div class="entry-utility"><span class="cat-links">Posted in <a href="http://www.holoborodko.com/pavel/category/filter-design/" rel="category tag">Filter Design</a>, <a href="http://www.holoborodko.com/pavel/category/numeric-analysis/" rel="category tag">Numeric Analysis</a>, <a href="http://www.holoborodko.com/pavel/category/numeric-analysis/numerical-integration/" rel="category tag">Numerical Integration</a></span> <span class="meta-sep">|</span> <span class="comments-link"><a href="http://www.holoborodko.com/pavel/2014/10/21/sinc-function-and-gauss-legendre-quadrature/#comments" title="Comment on Sinc Function and Gauss-Legendre quadrature">Leave a comment</a></span></div></div><div id="post-3029" class="hentry p4 post publish author-pavel-holoborodko category-mpfr category-programming untagged y2011 m09 d30 h23 alt slug-mpfr-c-debugger-visualizer-in-visual-studio"><h2 class="entry-title"><a href="http://www.holoborodko.com/pavel/2011/09/30/mpfr-c-debugger-visualizer-in-visual-studio/" title="Permalink to MPFR C++ Debugger Visualizer in Visual Studio" rel="bookmark">MPFR C++ Debugger Visualizer in Visual Studio</a></h2><div class="entry-meta"><span class="entry-date"><abbr class="published" title="2011-09-30T14:40:12+0900">September 30, 2011</abbr></span></div><div class="entry-content"><p>Built-in debugger in Visual Studio has very nice extension capabilities. One particularly useful feature &#8211; developer can create custom visualizers for his own complex data types. Usually interactive debugger just shows data members of user-defined (and unknown to him) classes and structures, e.g.:</p><p style="text-aling:center"> <img src="http://www.holoborodko.com/pavel/downloads/debug_before.png" alt="" /></p><p>Obviously this is not very handy. In example above <code>mpreal</code> is arbitrary precision floating-point numeric type. It is only natural to show variables of the type as numbers, not as collection of low-level data pointers and properties.<br /> <a href="http://www.holoborodko.com/pavel/2011/09/30/mpfr-c-debugger-visualizer-in-visual-studio/#more-3029" class="more-link">Read More <span class="meta-nav">&raquo;</span></a></p></div><div class="entry-utility"><span class="cat-links">Posted in <a href="http://www.holoborodko.com/pavel/category/mpfr/" rel="category tag">MPFR</a>, <a href="http://www.holoborodko.com/pavel/category/programming/" rel="category tag">Programming</a></span> <span class="meta-sep">|</span> <span class="comments-link"><a href="http://www.holoborodko.com/pavel/2011/09/30/mpfr-c-debugger-visualizer-in-visual-studio/#comments" title="Comment on MPFR C++ Debugger Visualizer in Visual Studio">6 Comments</a></span></div></div><div id="post-2874" class="hentry p5 post publish author-pavel-holoborodko category-quicklatex untagged y2011 m05 d10 h04 slug-chemistry-in-wordpress-using-quicklatex"><h2 class="entry-title"><a href="http://www.holoborodko.com/pavel/2011/05/09/chemistry-in-wordpress-using-quicklatex/" title="Permalink to Chemistry in WordPress using QuickLaTeX" rel="bookmark">Chemistry in WordPress using QuickLaTeX</a></h2><div class="entry-meta"><span class="entry-date"><abbr class="published" title="2011-05-09T19:02:14+0900">May 9, 2011</abbr></span></div><div class="entry-content"><p>New version of QuickLaTeX is out &#8211; 3.7.7. Besides improvements in general functionality it includes special features for chemistry-oriented web sites:</p><ul><li style="text-align: justify; padding-bottom:10px;"> Support of <code>myChemistry</code> environment <code>&#92;&#98;&#101;&#103;&#105;&#110;&#123;&#114;&#120;&#110;&#125;&#32;&#46;&#46;&#46;&#92;&#101;&#110;&#100;&#123;&#114;&#120;&#110;&#125;</code> directly in the text (do not forget to include <code>myChemistry</code> into global/local preamble). Check examples on <a href="http://www.mychemistry.eu/" onclick="javascript:_gaq.push(['_trackEvent','outbound-article','http://www.mychemistry.eu/']);">myChemistry home page</a>.</li><li style="text-align: justify; padding-bottom:10px;"> Correct support of <code>ChemFig</code> package, no tikzpicture wrapping required anymore. However you have to use <code>&#91;&#108;&#97;&#116;&#101;&#120;&#93;&#32;&#46;&#46;&#46;&#32;&#91;&#47;&#108;&#97;&#116;&#101;&#120;&#93;</code> tags to mark <code>ChemFig</code> code sections. We didn&#8217;t implement support <code>ChemFig</code> commands directly in the text since one picture can be generated using long sequence of commands, there is no way for QuickLaTeX to know where diagram starts/ends. <a href="http://www.holoborodko.com/pavel/2011/05/09/chemistry-in-wordpress-using-quicklatex/#more-2874" class="more-link">Read More <span class="meta-nav">&raquo;</span></a></li></ul></div><div class="entry-utility"><span class="cat-links">Posted in <a href="http://www.holoborodko.com/pavel/category/quicklatex/" rel="category tag">QuickLaTeX</a></span> <span class="meta-sep">|</span> <span class="comments-link"><a href="http://www.holoborodko.com/pavel/2011/05/09/chemistry-in-wordpress-using-quicklatex/#comments" title="Comment on Chemistry in WordPress using QuickLaTeX">Leave a comment</a></span></div></div><div id="post-2663" class="hentry p6 post publish author-pavel-holoborodko category-quicklatex tag-diagram tag-hackenbush tag-quicklatex y2011 m02 d16 h01 alt slug-quicklatex-hackenbush-diagram"><h2 class="entry-title"><a href="http://www.holoborodko.com/pavel/2011/02/15/quicklatex-hackenbush-diagram/" title="Permalink to QuickLaTeX: Hackenbush diagram" rel="bookmark">QuickLaTeX: Hackenbush diagram</a></h2><div class="entry-meta"><span class="entry-date"><abbr class="published" title="2011-02-15T16:57:42+0900">February 15, 2011</abbr></span></div><div class="entry-content"><p>Today I stumbled across <a href="http://tex.stackexchange.com/questions/11105/tikz-diagrams-in-math-mode" onclick="javascript:_gaq.push(['_trackEvent','outbound-article','http://tex.stackexchange.com/questions/11105/tikz-diagrams-in-math-mode']);">Tikz Diagrams in Math Mode</a> topic on <a href="http://tex.stackexchange.com/" onclick="javascript:_gaq.push(['_trackEvent','outbound-article','http://tex.stackexchange.com/']);">tex.SE</a>. Here is how QuickLaTeX solves the task (example is taken from one of the answers in the thread):</p><p class="ql-center-picture"><img src="http://www.holoborodko.com/pavel/wp-content/ql-cache/quicklatex.com-ff598f999536267e5150768c8d5953b8_l3.png" height="64" width="276" class="ql-img-picture quicklatex-auto-format" alt="Rendered by QuickLaTeX.com" title="Rendered by QuickLaTeX.com"/></p><p> <a href="http://www.holoborodko.com/pavel/2011/02/15/quicklatex-hackenbush-diagram/#more-2663" class="more-link">Read More <span class="meta-nav">&raquo;</span></a></p></div><div class="entry-utility"><span class="cat-links">Posted in <a href="http://www.holoborodko.com/pavel/category/quicklatex/" rel="category tag">QuickLaTeX</a></span> <span class="meta-sep">|</span><span class="tag-links"> Tagged <a href="http://www.holoborodko.com/pavel/tag/diagram/" rel="tag">diagram</a>, <a href="http://www.holoborodko.com/pavel/tag/hackenbush/" rel="tag">Hackenbush</a>, <a href="http://www.holoborodko.com/pavel/tag/quicklatex/" rel="tag">QuickLaTeX</a></span> <span class="meta-sep">|</span> <span class="comments-link"><a href="http://www.holoborodko.com/pavel/2011/02/15/quicklatex-hackenbush-diagram/#comments" title="Comment on QuickLaTeX: Hackenbush diagram">Leave a comment</a></span></div></div><div id="post-2594" class="hentry p7 post publish author-pavel-holoborodko category-quicklatex tag-quicklatex tag-tikz tag-tikz-timing y2011 m02 d09 h20 slug-quicklatex-tikz-timing-package"><h2 class="entry-title"><a href="http://www.holoborodko.com/pavel/2011/02/09/quicklatex-tikz-timing-package/" title="Permalink to QuickLaTeX: tikZ-timing package" rel="bookmark">QuickLaTeX: tikZ-timing package</a></h2><div class="entry-meta"><span class="entry-date"><abbr class="published" title="2011-02-09T11:02:06+0900">February 9, 2011</abbr></span></div><div class="entry-content"><p>LaTeX package <code>tikZ-timing</code> created by <a href="http://latex.scharrer-online.de/" onclick="javascript:_gaq.push(['_trackEvent','outbound-article','http://latex.scharrer-online.de/']);">Martin Scharrer</a> allows easy typing of timing diagrams (digital waveforms) in offline documents.</p><p>With the aid of QuickLaTeX <code>tikZ-timing</code> diagrams can be used seamlessly in the WordPress blogs (or any other website). You can just paste <code>tikZ-timing</code> commands directly in the text &#8211; QuickLaTeX will compile them into images and embed in the published page.</p><p> <a href="http://www.holoborodko.com/pavel/2011/02/09/quicklatex-tikz-timing-package/#more-2594" class="more-link">Read More <span class="meta-nav">&raquo;</span></a></p></div><div class="entry-utility"><span class="cat-links">Posted in <a href="http://www.holoborodko.com/pavel/category/quicklatex/" rel="category tag">QuickLaTeX</a></span> <span class="meta-sep">|</span><span class="tag-links"> Tagged <a href="http://www.holoborodko.com/pavel/tag/quicklatex/" rel="tag">QuickLaTeX</a>, <a href="http://www.holoborodko.com/pavel/tag/tikz/" rel="tag">tikZ</a>, <a href="http://www.holoborodko.com/pavel/tag/tikz-timing/" rel="tag">tikz-timing</a></span> <span class="meta-sep">|</span> <span class="comments-link"><a href="http://www.holoborodko.com/pavel/2011/02/09/quicklatex-tikz-timing-package/#comments" title="Comment on QuickLaTeX: tikZ-timing package">2 Comments</a></span></div></div><div id="post-2580" class="hentry p8 post publish author-pavel-holoborodko category-quicklatex tag-quicklatex tag-wordpress y2011 m02 d09 h06 alt slug-quicklatex-laplace-transformation-symbols"><h2 class="entry-title"><a href="http://www.holoborodko.com/pavel/2011/02/08/quicklatex-laplace-transformation-symbols/" title="Permalink to QuickLaTeX: Laplace Transformation Symbols" rel="bookmark">QuickLaTeX: Laplace Transformation Symbols</a></h2><div class="entry-meta"><span class="entry-date"><abbr class="published" title="2011-02-08T21:35:40+0900">February 8, 2011</abbr></span></div><div class="entry-content"><p>There are special commands for Laplace-Transformation Symbols in <code>trfsigns</code> package (see <a href="http://www.ctan.org/tex-archive/info/symbols/comprehensive/symbols-letter.pdf" onclick="javascript:_gaq.push(['_trackEvent','outbound-article','http://www.ctan.org/tex-archive/info/symbols/comprehensive/symbols-letter.pdf']);" rel="nofollow">The Comprehensive <img src="http://www.holoborodko.com/pavel/wp-content/ql-cache/quicklatex.com-b73b5686a987bf1cb4a42f02eca339dd_l3.png" class="ql-img-inline-formula quicklatex-auto-format" alt="&#92;&#116;&#101;&#120;&#116;&#114;&#109;&#123;&#92;&#76;&#97;&#84;&#101;&#88;&#125;" title="Rendered by QuickLaTeX.com" height="19" width="51" style="vertical-align: -4px;"/> Symbol List</a>, Table 81, page 40): <code>\laplace </code> and <code>\Laplace </code>.</p><p>To use them with QuickLaTeX, just include <code>trfsigns</code> in preamble (local or global), e.g:</p><pre>&#92;&#91; &#91;&#43;&#112;&#114;&#101;&#97;&#109;&#98;&#108;&#101;&#93; &#32;&#32;&#32;&#92;&#117;&#115;&#101;&#112;&#97;&#99;&#107;&#97;&#103;&#101;&#123;&#116;&#114;&#102;&#115;&#105;&#103;&#110;&#115;&#125; &#91;&#47;&#112;&#114;&#101;&#97;&#109;&#98;&#108;&#101;&#93; &#32;&#32;&#102;&#40;&#116;&#41;&#32;&#92;&#108;&#97;&#112;&#108;&#97;&#99;&#101;&#32;&#70;&#40;&#115;&#41;&#32;&#92;&#113;&#113;&#117;&#97;&#100;&#32;&#70;&#40;&#115;&#41;&#32;&#92;&#76;&#97;&#112;&#108;&#97;&#99;&#101;&#32;&#102;&#40;&#116;&#41; &#92;&#93;</pre><p>results in</p><p class="ql-center-displayed-equation" style="line-height: 20px;"><span class="ql-right-eqno"> &nbsp; </span><span class="ql-left-eqno"> &nbsp; </span><img src="http://www.holoborodko.com/pavel/wp-content/ql-cache/quicklatex.com-362a8a6328a816caa57abe7fae1de3ee_l3.png" height="20" width="268" class="ql-img-displayed-equation quicklatex-auto-format" alt="&#92;&#91; &#32;&#32;&#102;&#40;&#116;&#41;&#32;&#92;&#108;&#97;&#112;&#108;&#97;&#99;&#101;&#32;&#70;&#40;&#115;&#41;&#32;&#92;&#113;&#113;&#117;&#97;&#100;&#32;&#70;&#40;&#115;&#41;&#32;&#92;&#76;&#97;&#112;&#108;&#97;&#99;&#101;&#32;&#102;&#40;&#116;&#41; &#92;&#93;" title="Rendered by QuickLaTeX.com"/></p><p>Can you do that with other LaTeX plugins for WordPress :-)?</p></div><div class="entry-utility"><span class="cat-links">Posted in <a href="http://www.holoborodko.com/pavel/category/quicklatex/" rel="category tag">QuickLaTeX</a></span> <span class="meta-sep">|</span><span class="tag-links"> Tagged <a href="http://www.holoborodko.com/pavel/tag/quicklatex/" rel="tag">QuickLaTeX</a>, <a href="http://www.holoborodko.com/pavel/tag/wordpress/" rel="tag">WordPress</a></span> <span class="meta-sep">|</span> <span class="comments-link"><a href="http://www.holoborodko.com/pavel/2011/02/08/quicklatex-laplace-transformation-symbols/#comments" title="Comment on QuickLaTeX: Laplace Transformation Symbols">1 Comment</a></span></div></div><div id="post-2520" class="hentry p9 post publish author-pavel-holoborodko category-quicklatex tag-quicklatex tag-tikz tag-wordpress y2011 m02 d07 h10 slug-quicklatex-tikz-graphics"><h2 class="entry-title"><a href="http://www.holoborodko.com/pavel/2011/02/07/quicklatex-tikz-graphics/" title="Permalink to QuickLaTeX: tikZ graphics" rel="bookmark">QuickLaTeX: tikZ graphics</a></h2><div class="entry-meta"><span class="entry-date"><abbr class="published" title="2011-02-07T01:05:19+0900">February 7, 2011</abbr></span></div><div class="entry-content"><p><a href="http://www.holoborodko.com/pavel/quicklatex/" >QuickLaTeX</a> is free online service which allows LaTeX usage on the web pages.</p><p>QuickLaTeX supports <code>tikZ</code> graphics since version 3.7.1.</p><p>User can insert <code>tikZ</code> code snippets directly on the page (in WordPress editor) between <code>&#92;&#98;&#101;&#103;&#105;&#110;&#123;&#116;&#105;&#107;&#122;&#112;&#105;&#99;&#116;&#117;&#114;&#101;&#125;&#32;&#46;&#46;&#46;&#32;&#92;&#101;&#110;&#100;&#123;&#116;&#105;&#107;&#122;&#112;&#105;&#99;&#116;&#117;&#114;&#101;&#125;</code> commands. QuickLaTeX will render it into image and place on the page.</p><p> <a href="http://www.holoborodko.com/pavel/2011/02/07/quicklatex-tikz-graphics/#more-2520" class="more-link">Read More <span class="meta-nav">&raquo;</span></a></p></div><div class="entry-utility"><span class="cat-links">Posted in <a href="http://www.holoborodko.com/pavel/category/quicklatex/" rel="category tag">QuickLaTeX</a></span> <span class="meta-sep">|</span><span class="tag-links"> Tagged <a href="http://www.holoborodko.com/pavel/tag/quicklatex/" rel="tag">QuickLaTeX</a>, <a href="http://www.holoborodko.com/pavel/tag/tikz/" rel="tag">tikZ</a>, <a href="http://www.holoborodko.com/pavel/tag/wordpress/" rel="tag">WordPress</a></span> <span class="meta-sep">|</span> <span class="comments-link"><a href="http://www.holoborodko.com/pavel/2011/02/07/quicklatex-tikz-graphics/#comments" title="Comment on QuickLaTeX: tikZ graphics">5 Comments</a></span></div></div><div id="post-2384" class="hentry p10 post publish author-pavel-holoborodko category-programming tag-c tag-qextserialport tag-qt y2011 m02 d02 h00 alt slug-how-to-compile-qextserialport-wit-visual-studio-2010"><h2 class="entry-title"><a href="http://www.holoborodko.com/pavel/2011/02/01/how-to-compile-qextserialport-wit-visual-studio-2010/" title="Permalink to How To: QextSerialPort for Visual Studio 2010" rel="bookmark">How To: QextSerialPort for Visual Studio 2010</a></h2><div class="entry-meta"><span class="entry-date"><abbr class="published" title="2011-02-01T15:05:06+0900">February 1, 2011</abbr></span></div><div class="entry-content"><p>QextSerialPort is a nice library for serial port communication. It is based on C++ cross-platform Qt framework and must have in the toolkit of DSP/embedded software developer.</p><p>I&#8217;ve spent several hours trying to compile QextSerialPort for Visual Studio 2010 + Qt 4.7.1. Here is my recipe to success.</p><p>We assume that Qt is installed in <code>C:\Qt\4.7.1</code> (see <a href="http://www.holoborodko.com/pavel/2011/02/01/how-to-compile-qt-4-7-with-visual-studio-2010/" >How To Compile Qt 4.7 with Visual Studio 2010</a> for instructions).</p><p> <a href="http://www.holoborodko.com/pavel/2011/02/01/how-to-compile-qextserialport-wit-visual-studio-2010/#more-2384" class="more-link">Read More <span class="meta-nav">&raquo;</span></a></p></div><div class="entry-utility"><span class="cat-links">Posted in <a href="http://www.holoborodko.com/pavel/category/programming/" rel="category tag">Programming</a></span> <span class="meta-sep">|</span><span class="tag-links"> Tagged <a href="http://www.holoborodko.com/pavel/tag/c/" rel="tag">C++</a>, <a href="http://www.holoborodko.com/pavel/tag/qextserialport/" rel="tag">QextSerialPort</a>, <a href="http://www.holoborodko.com/pavel/tag/qt/" rel="tag">Qt</a></span> <span class="meta-sep">|</span> <span class="comments-link"><a href="http://www.holoborodko.com/pavel/2011/02/01/how-to-compile-qextserialport-wit-visual-studio-2010/#comments" title="Comment on How To: QextSerialPort for Visual Studio 2010">12 Comments</a></span></div></div><div id="nav-below" class="navigation"><div class="nav-previous"><a href="http://www.holoborodko.com/pavel/page/2/" ><span class="meta-nav">&laquo;</span> Older posts</a></div><div class="nav-next"></div></div></div></div></div><div id="footer"><div id="siteinfo"> Powered by <a class="wp-link" href="http://WordPress.org/" title="WordPress" rel="generator">WordPress</a> with <a href="http://www.holoborodko.com/pavel/quicklatex/">QuickLaTeX</a>. 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