How can I map the frequency component of FFT?

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Lara nahmah
Lara nahmah on 25 Aug 2015
I have convert a transfer function of time domain into frequency domain by using FFT(x,nfft) but the result will be for the whole frequency components ( that means from zero to sampling frequency) and according to my work I want a specific frequency components for specific frequencies (for example from 500 Hz to 1000 Hz) can you please help me

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