using DCT for taking spectral derivative

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Bo
Bo le 24 Juin 2014
Hi, I have use FFT in matlab to take a function's derivative. Since I always work with real data, can I use DCT to do the same thing (because it is supposed to be faster)?
I found an old thread:
http://www.mathworks.com/matlabcentral/newsreader/view_thread/42166
But there hasn't been any answers yet.
Could anyone help? Thanks!
Bo

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