'Trying to plot contours on Mac using the same script I use on windows on gnuplot

I have an issue with gnuplot on Mac. On windows everything seems fine I can easily draw contours on a "heat map". But on my Mac using the same script I can plot the map but not the contours on top of it.

https://imgur.com/a/x00bFnJ here is the two images. One with the contours is on Windows, other one is on Mac.

https://justpaste.it/6ws4h and here is the script.

I tried grid3d but they seem like not nearly accurate as the ones I have plotted on windows.

gnuplot


Solution 1:[1]

Well! I will answer my own question.

set pm3d map 
set contour surface 
set cntrparam ... 
sp "DATA" u 1:2:3  with pm3d lw 2,"" u 1:2:3 with lines nosurf

Solved my problem.!

Solution 2:[2]

I cannot explain the difference between your two machines, but I think I can see where the problem arises. The following lines from your script are inconsistent with producing a plot with both a surface and contours shown:

set style data pm3d
set style function pm3d
set pm3d explicit at b
splot DATA with pm3d        # command simplified

The issue is that both the default style and the explicit plot command specify pm3d, which is a filled-area surface plot. But contours need to be drawn with lines or with labels. You need some combination of defaults and explicit styles that allows you to mix both a surface and lines. I think either of these would do the trick:

set pm3d explicit
set style data lines
splot DATA with pm3d

or

set pm3d implicit
splot DATA with lines

Sources

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Source: Stack Overflow

Solution Source
Solution 1 DoubleOreo
Solution 2 Ethan

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