📄 heatmapdemo.html
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"><html xmlns:mwsh="http://www.mathworks.com/namespace/mcode/v1/syntaxhighlight.dtd"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <!--This HTML is auto-generated from an M-file.To make changes, update the M-file and republish this document. --> <title>Annotated Heat Maps</title> <meta name="generator" content="MATLAB 7.5"> <meta name="date" content="2007-08-09"> <meta name="m-file" content="heatmapdemo"><style>body { background-color: white; margin:10px;}h1 { color: #990000; font-size: x-large;}h2 { color: #990000; font-size: medium;}/* Make the text shrink to fit narrow windows, but not stretch too far in wide windows. */ p,h1,h2,div.content div { max-width: 600px; /* Hack for IE6 */ width: auto !important; width: 600px;}pre.codeinput { background: #EEEEEE; padding: 10px;}@media print { pre.codeinput {word-wrap:break-word; width:100%;}} span.keyword {color: #0000FF}span.comment {color: #228B22}span.string {color: #A020F0}span.untermstring {color: #B20000}span.syscmd {color: #B28C00}pre.codeoutput { color: #666666; padding: 10px;}pre.error { color: red;}p.footer { text-align: right; font-size: xx-small; font-weight: lighter; font-style: italic; color: gray;} </style></head> <body> <div class="content"> <h1>Annotated Heat Maps</h1> <introduction> <p>A number of people have asked me whether MATLAB can add text to heatmaps to show the exact values. This is very easy to do, however, making a the text robust to resizing, zooming and other operations is a little trickier. </p> </introduction> <h2>Contents</h2> <div> <ul> <li><a href="#1">A basic heat map</a></li> <li><a href="#2">Adding text</a></li> <li><a href="#3">Problems with this basic method</a></li> <li><a href="#4">A function to work around this problem</a></li> <li><a href="#6">Some more examples</a></li> </ul> </div> <h2>A basic heat map<a name="1"></a></h2> <p>The <b>image</b> command or <b>imagesc</b> command can be used to create heat maps. The difference between the two functions is that <b>imagesc</b> scales the colormap of the image to give the maximum range of colors. For this example I will use some of the matrices in <b>gallery</b>. </p><pre class="codeinput">data = gallery(<span class="string">'invhess'</span>,20);imagesc(data)axis <span class="string">off</span></pre><img vspace="5" hspace="5" src="heatmapdemo_01.png"> <h2>Adding text<a name="2"></a></h2> <p>When the heat map is small, it is sometimes convenient to see the actual data values on the image. These are easy to add using the <b>text</b> function. </p><pre class="codeinput">[rows,cols] = size(data);<span class="keyword">for</span> i = 1:rows <span class="keyword">for</span> j = 1:cols textHandles(j,i) = text(j,i,num2str(data(i,j)),<span class="keyword">...</span> <span class="string">'horizontalAlignment'</span>,<span class="string">'center'</span>); <span class="keyword">end</span><span class="keyword">end</span></pre><img vspace="5" hspace="5" src="heatmapdemo_02.png"> <h2>Problems with this basic method<a name="3"></a></h2> <p>This is fine until you resize the figure or zoom in. The font size for the text is fixed so the image quickly gets messy if you make it small. </p><pre class="codeinput">set(gcf,<span class="string">'position'</span>,[100,100,300,300])</pre><img vspace="5" hspace="5" src="heatmapdemo_03.png"> <h2>A function to work around this problem<a name="4"></a></h2> <p>around this I have created a function <b>heatmaptext</b> that adds listeners to the figure that adjust the font size of the text if the figure is resized or if you zoom in on the heat map. </p><pre class="codeinput">figureheatmaptext(data);</pre><img vspace="5" hspace="5" src="heatmapdemo_04.png"> <p>This function is robust to resizing of the figure.</p><pre class="codeinput">set(gcf,<span class="string">'position'</span>,[100,100,300,300])</pre><img vspace="5" hspace="5" src="heatmapdemo_05.png"> <h2>Some more examples<a name="6"></a></h2><pre class="codeinput">figuredata = randn(40,20);heatmaptext(data,<span class="string">'fontcolor'</span>,<span class="string">'w'</span>,<span class="string">'precision'</span>,3);colormap(redgreencmap)set(gca,<span class="string">'Xlim'</span>,[4.5,10.5],<span class="string">'Ylim'</span>,[5.5,9.5]);</pre><img vspace="5" hspace="5" src="heatmapdemo_06.png"> <pre class="codeinput">figuredata = gallery(<span class="string">'moler'</span>,25);heatmaptext(data,<span class="string">'fontcolor'</span>,<span class="string">'r'</span>);colormap(bone)</pre><img vspace="5" hspace="5" src="heatmapdemo_07.png"> <p class="footer">Copyright 2007 The MathWorks, Inc.<br> Published with MATLAB® 7.5<br></p> </div> <!--##### SOURCE BEGIN #####%% Annotated Heat Maps % A number of people have asked me whether MATLAB can add text to heatmaps% to show the exact values. This is very easy to do, however, making a the% text robust to resizing, zooming and other operations is a little% trickier.%% A basic heat map% The *image* command or *imagesc* command can be used to create heat maps.% The difference between the two functions is that *imagesc* scales the% colormap of the image to give the maximum range of colors. For this% example I will use some of the matrices in *gallery*. data = gallery('invhess',20);imagesc(data)axis off%% Adding text% When the heat map is small, it is sometimes convenient to see the actual% data values on the image. These are easy to add using the *text*% function.[rows,cols] = size(data);for i = 1:rows for j = 1:cols textHandles(j,i) = text(j,i,num2str(data(i,j)),... 'horizontalAlignment','center'); endend%% Problems with this basic method% This is fine until you resize the figure or zoom in. The font size for the text is% fixed so the image quickly gets messy if you make it small. set(gcf,'position',[100,100,300,300])%% A function to work around this problem% around this I have created a function *heatmaptext* that adds listeners% to the figure that adjust the font size of the text if the figure is% resized or if you zoom in on the heat map.figureheatmaptext(data);%%% This function is robust to resizing of the figure.set(gcf,'position',[100,100,300,300])%% Some more examplesfiguredata = randn(40,20);heatmaptext(data,'fontcolor','w','precision',3);colormap(redgreencmap)set(gca,'Xlim',[4.5,10.5],'Ylim',[5.5,9.5]);%% figuredata = gallery('moler',25);heatmaptext(data,'fontcolor','r');colormap(bone)%%% Copyright 2007 The MathWorks, Inc.##### SOURCE END #####--> </body></html>⌨️ 快捷键说明
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