Is it possible to use color scheme and draw color bar in log scale?

[T X]

I would like to draw some thing like the Rosenbrock function ( z = 100(x^2-y)^2 + (x-1)^2) by MathGL with the z-axis, the color scheme, the color bar all in log scale.

However, I failed to find any instructions in the document about the log scale setting of color scheme etc. Is there any way to realise this purpose?

[Alexey Balakin]

Hi,

The color coordinate have the same feature as other (X-,Y-,Z-coordinates). You just need to set formula for the last (4th) C-coordinate in curved coordinates specification. The sample code is

ranges -2 2 -1 3
axis:box
new a 300 300 '100*(x^2-y)^2 + (x-1)^2'
crange  0.001 1000
axis '' '' '' 'ln(c)'             # <-- here
dens a 'Bgy'
colorbar 'Bgy'
cont [0.01,0.1,1,10,100] a 'w_'

14.07.2022 15:06, T X пишет:

I would like to draw some thing like the Rosenbrock function ( z = 100(x^2-y)^2 + (x-1)^2) by MathGL with the z-axis, the color scheme, the color bar all in log scale.

However, I failed to find any instructions in the document about the log scale setting of color scheme etc. Is there any way to realise this purpose?

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Kind regards,
Alexey Balakin