Dear MKL forum,
I solve such a problem. Can you help me please?
Lets have a function Y=∑ k=−∞∞ iYneikπy and then I have a function which is defined as X=∑k=−∞∞ ik2Yneikπy.
I know the Y. The i is imaginary unit.
How can I compute the X? I think I do the FFT on Y and obtain thus the Yn, right? And then I think I will do the backward FFT of function defined as f=ik2Yn. But what have I do with the summation index k here in the function f?
It is right that FFT(ik2Yn)=X?
I'm not sure absolutely what to do with k when the FFT sum is summated per k. Or can I change something in MKL FFT directly?