DFT of large data sets

gaby_phys

Hi,

I've been loking for a matlab (script/algorithm) for Discrete Fourier Ttransform of a large data file which doesn't fit into the memory.
Has anyone attempted to do an FFT on segments read from a large file and reconstructing the Fourier spectrum out of these?
I am aware of the overlap-save and overlap-add methods for convolution of large data set with a response function, but not of an FFT of large data set alone.
Any suggestions will be most welcome!

Many thanks!

Gaby_phys