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  1. PO
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    <p>This one is actually a doosie and I can't make it happen without some *nix shell magic.</p> <p>First, we want to get the x tic labels and y tic labels:</p> <pre><code>XTICS="`awk 'BEGIN{getline}{printf "%s ",$1}' test.dat`" YTICS="`head -1 test.dat`" </code></pre> <p>At this point, XTICS is the string "F G H I J" and YTICS is the string "A B C D E".</p> <p>Now, we want to set the xtics by iteration:</p> <pre><code>set for [i=1:words(XTICS)] xtics ( word(XTICS,i) i-1 ) set for [i=1:words(YTICS)] ytics ( word(YTICS,i) i-1 ) </code></pre> <p>We've used 2 gnuplot builtin functions (<code>word</code> and <code>words</code>). <code>words(string)</code> counts how many words there are in the given string (a word is a character sequence separated by spaces). <code>word(string,n)</code> returns the n'th word in the string.</p> <p>Now, we can plot your datafile ... The only problem is that <code>matrix</code> wants to use <em>all rows and columns in your datafile</em>. You might be able to cut down the rows/columns actually read by using the <code>every</code> keyword, but I don't know how to do that on matrix files -- and I think it's probably easier to just keep on relying on shell utilities (<code>awk</code> and <code>sed</code>)</p> <pre><code>plot "&lt;awk '{$1=\"\"}1' test.dat | sed '1 d'" matrix w image #######^ replace the first field with nothing ################################## ^ delete first line </code></pre> <p>And now your plot (hopefully) looks the way you want it to.</p> <p><em>Also note that since we have used iteration, this script will only work in gnuplot 4.3 or higher -- Since the current stable is 4.6, hopefully that's Ok.</em></p>
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    1. POgnuplot: label x and y-axis of matrix (heatmap) with row and column names
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    1. COYou, sir, are my hero of the day. Thank you very much!
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    2. CO@zenbomb -- No problem. It was actually kind of a fun game for me to try to figure it out. I don't work with `matrix` datafiles often, so it was a good chance for me to learn something new about gnuplot.
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