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POhide C++ Gnuplot pipe console output
 

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    <p>In <code>C++</code>I'm currently using this bit of code to plot some data using <code>gnuplot</code>. <code>Gnuplot</code>'s <code>fit</code> command, however, produces a lot of unwanted output on the command line console (which I use for outputting some other stuff too, throughout the rest of my program). </p> <p>Since this output clutters up my console output, I would like to disable it. There should be 2 ways to do this:</p> <ol> <li>Hide output created by external programs using <code>pipe</code> in <code>C++</code></li> <li>Telling <code>gnuplot</code> to be silent and not output that much</li> </ol> <p><code>FILE *pipe = popen("gnuplot -persist", "w");//open up a pipe to gnuplot</code></p> <pre><code>fprintf(pipe, "set terminal x11 enhanced\n"); //set appropriate output terminal for the plot fprintf(pipe, "set xlabel 'N'\n");//set xlabel fprintf(pipe, "set ylabel 'error'\n");//set ylabel fprintf(pipe, "set yrange [0:0.0001]\n");//set the y range fprintf(pipe, "plot 'dataSimp.dat' ti 'Simpson method'\n");//plot the Simp error fprintf(pipe, "replot 'dataTrap.dat' ti 'Trapezium method' \n");//plot the Trap error fprintf(pipe, "replot 1/(x**2) ti '1/{x^2}'\n");//plot y=1/(x^2) function for comparison fprintf(pipe, "replot 1/(x**4) ti '1/{x^4}'\n");//plot y=1/(x^4) function for comparison //fit curve to dataSimp fprintf(pipe, "set output 'rommel.txt'"); fprintf(pipe, "fSimp(x)=aSimp/(x**4) \n"); fprintf(pipe, "fit fSimp(x) 'dataSimp.dat' via aSimp\n"); fprintf(pipe, "replot aSimp/(x**4) ti 'fitted aSimp/{x^4}'\n"); //fit curve to dataSimp fprintf(pipe, "fTrap(x)=aTrap/(x**2) \n"); fprintf(pipe, "fit fTrap(x) 'dataTrap.dat' via aTrap \n"); fprintf(pipe, "replot aTrap/(x**2) ti 'fitted aTrap/{x^2}'\n"); pclose(pipe);//close gnuplot pipe </code></pre>
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