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  1. PO
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    <p>The easiest (maybe only viable) way is to add some dummy data points and use <code>splot ... with pm3d</code>. This plotting style handles heatmaps with general quadrangles. </p> <p>The <code>image</code> plotting style plots one box (one big pixel) for each data point, while <code>pm3d</code> takes each data point as corner of one or more quadrangles. The color of each quadrangles is determined by the values of the corners and is adjustable with <code>set pm3d corners2color</code>.</p> <p>So, in your case you need to expand the <code>4x4</code> matrix to a <code>5x5</code> matrix (expand to right and top), but select the lower left corner to determine the color <code>set pm3d corners2color c1</code>.</p> <p>The changed data file is then:</p> <pre><code>1 1 0.2 1 2 0.8 1 3 0.1 1 4 0.2 1 5 0.5 2 1 0.7 2 2 0.2 2 3 0.3 2 4 0.1 2 5 0.5 5 1 0.2 5 2 0.4 5 3 0.1 5 4 0.9 5 5 0.5 7 1 0.3 7 2 0.2 7 3 0.9 7 4 0.6 7 5 0.5 10 1 0.5 10 2 0.5 10 3 0.5 10 4 0.5 10 5 0.5 </code></pre> <p>To plot it use</p> <pre><code>set pm3d map corners2color c1 set autoscale fix set ytics 1 splot 'mydata.dat' using 1:($2-0.5):3 notitle </code></pre> <p>The result with 4.6.3 is:</p> <p><img src="https://i.stack.imgur.com/Cc1ku.png" alt="enter image description here"></p> <p>In general, the <code>z</code>-value of the dummy data points doesn't matter, but in the above script it should lay somewhere between minimum and maximum values to allow <code>set autoscale fix</code> to work properly on the color scale.</p> <p>If you don't want to change the data file manually, you could do it with some script, but that's a different question.</p>
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    1. POHeatmap with Gnuplot on a non-uniform grid
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    1. USChristoph
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    1. COThank you very much Christoph, that's exactly what I was looking for!
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