interpolate 1D ntimes

[altenbach]

Well, you are looking in the wrong place. Row 1 is the frequency axis, not the power spectrum.

To get the correct X values, you need to do as I did in the B example above. You cannot multiply the original x-axis with any factor, because they are inversely related df=1/(N*dt).

In my example code:

ntimes=05 X(10)=0.0332, Y(10)=0.1499

ntimes=10 X(10)=0.0332, Y(10)=0.1494

The X are the same and the y differ by 0.0005. 🙂 Right?

Close enough! 😄

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cig438 wrote: Something must be wrong in my code - maybe you can show me explicitly how you would change it get a constant MTF array independent of ntimes ?

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Yes, check out my example code above:  MTF_exampleMOD_B.vi

[cig438]

Yes - I understand it now. I was not specifying the dt correctly & also should have been scaling the x-axis after the power spectrum generation.
Thanks for the help. 🙂