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I have a data file with x, y, and z datums--basically x,y locations with z representing attenuation at that location.

The answer to a question like Line plot in GnuPlot where line color is a third column in my data file? using palette defined (with palette z) is very close, except that each line segment is set to a single color along its length.

Is there a way to have the Z value interpolated (linear is fine) along each segment, so the attenuation values are a smooth gradient rather than jumping values at each segment boundary?

Community
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Andrew Valencia
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1 Answers1

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You can use set dgrid3d to interpolate a given data set. Consider the data file test.dat with the content

1 2 1
2 3 2
1 1 2

Plot this with 

set dgrid3d 30,30 splines
set ticslevel 0
set hidden3d
splot 'test.dat' matrix w l lc palette lw 3

to get

enter image description here

If this works also in your case depends on several other factors, like number of data points or if you don't want to create a new grid, but retain the original grid, and only smooth the colors. In the latter case you must write an external script to prepare your data in an appropriate way.

Christoph
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