How do I interpolate 3 variables to create a scatter plot?

Hello everyone! I have 3 variables: frequency, amplitude and reflection coefficient in form of 41x10 arrays.

Now I would need to interpolate those reflection coefficients in smaller gaps of frequencies and amplitudes (i.e. 10 Hz instead of 20 Hz) in order to increase the resolution of my scatter plot.

Can someone help me?

Many thanks. Carlo

Answer 1

[Adam]

doc interp2

[Carlo Di Giovine]

it seems not so easy using that. I do not have monotonically increasing variables.

Answer 2

[Walter Roberson]

griddata and then sample at the appropriate grid locations