I just learned C programming a few weeks ago, so a lot of stuff is a
bit over my head. Currently, I'm doing some research for one of
my professors. He asked that I learn C in order to write a
program that calculates the power spectrums of various molecular
systems. Anyway, I'm trying to use MKL to calculate the DFT of
the velocity autocorrelation function of these systems. I have
already written the program for the autocorrelation. The data is
stored in a 1-D array I call Cv[i] (i is the time domain index).
I also have my n value assigned to a variable I call Ntstep. All
I need to do is calculate the DFT of the 1-D, real data in that
array. I would like my output to be complex, and in two arrays of
the form Sreal[j] and Simag[j] (j is the frequency domain index).
This way I can calculate the power spectrum from the DFT. It
seems simple enough; and, in fact, I can write three or four lines to
do this without MKL, but the computation is very slow. So, my
professor has asked me to use MKL. I vaguely understand how the
examples work, and they don't seem to offer much help since they seem
to read in data that is calculated by a program called
dfti_examples_support.c; my data is just sitting there in an
array....How do I use it? Please, anyone that can get me going
here will have ended a couple weeks worth of incredible
frustration. Any suggestions or examples?