I want to have a 3D diagramm. My Information are:

   - x:Time ----- it could be 1:n (integer number)
   - Y:Frequency ---it could be 1:n like x

z:the value of z come from a function

*fft_amplitude <- function(x) {sqrt((Re(fft(x)))^2+(Im(fft(x)))^2)}*

**

The input values for this function should be read from a CSV file. How can
I draw a 3D diagram* *perspwith this infos?

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