Alexander Brock

Thank you, that was very helpful. I wanted to report that pm3d has the disadvantage (compared to image) that if I set the xrange to start or end in the middle of a "pixel" that rectangle doesn't get plotted but it is fixed in the git version I tried. Therefore all my current problems with gnuplot have been solved :-) Regarding the behavior of plotting with image I think it would be nice if there was a warning for non-regular spaced grids.

I made more examples showcasing what I expected: First, a 1D example 1d.gpl plots some data into 1d.png (as expected) 1d-log.gpl set logscale x and plots with using "10 to the power of $1":2, so the values on the x-axis change but the graphical appeareance of the curve stays exactly the same. This also works as expected. Now, the 2D example: 2d.gpl plots data as expected. 2d-log-x.gpl basically does the same thing as 1d-log.gpl and therefore the result should look the same as 2d.png except for the...

logarithmic dataset with 2D heatmap

I found the same problem and made the simplest example I could think of. If you look at the file "2d-exp.data" you'll see that the x-values are 10, 100, 1'000, 10'000 and 100'000 but in the plot the first bin occupies roughly [10:10'000], the second bin [10k:40k], the third bin [40k:60k], the fourth bin [60k:80k] and the last bin [80k:105k] I verified that with gnuplot 5.2 patchlevel 8 on Debian Bullseye (5.4.1+dfsg1-1) and with the latest git version (40a9029b292812cd5a69134b140841746767a93b)

That works nicely for me, thank you. I think the manual should be updated, in the example it says "catch (TCLAP::ArgException &e) // catch any exceptions" so I got confused when my program terminated and gdb wouldn't show me any reason for that.

I messed up the title, I wanted "Check arguments vector is not empty before accessing first element" but it seems I can't edit titles

Check

Please don't exit(), throw an exception a user may catch.