FFT of matrix ?

[rainer gunnar]

I need to perform a FFT of an array of vectors. If I solve it via N-loop the calculation takes time. It would be much faster if I could pass the full matrix to a function in C++ code. Is there such a possibility or a trick to speed up the calculation with available LV 7.0 functions?
Thanks in advance for your help.

[DSA]

Hi,

You can use the Code interface node or the Call library function node in the Advanced toolbar to call C code or directly a DLL.

It's also  possible to use MalLab with the MATLAB script node (Analyse toolbar --> Mathematics --> Formula) if you want to use its FFT function.

I recently use the MatLab node and the Call library function node and it is simple to use.

Hope this help,

David

[aoh]

NI FFT VIs save some internal info to speed up the computation if you perform the same size FFT repeadly (This is just your case--N vectors of the same size). So you can just solve your problem via N-loop.  Don't worry about it. NI FFT knows how to take advantage of the same size in the continuous computation.