https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/MKL-DFT/m-p/914105#M12423 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?<BR /></J></J></I> Tue, 15 Aug 2006 01:13:10 GMT alanderv 2006-08-15T01:13:10Z https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/MKL-DFT/m-p/914105#M12423 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?<BR /></J></J></I> Tue, 15 Aug 2006 01:13:10 GMT https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/MKL-DFT/m-p/914105#M12423 alanderv 2006-08-15T01:13:10Z