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Filtering Data

sean roubion
Posted 11 years ago
I have taken a DFT of some data points I called "v" which was a 193 data points.
a = Fourier[{v}, FourierParameters -> {1, 1}];
The Fourier returned a 193 data points. As it turned out, I don't need all of them. In the output, how can tell Mathematica to index points 90 to a 105 to be 0? In other words, instead of having to painstakingly count and find out which points are between 90 and 105, Mathematica does it automatically sets them to 0.

Thank you in advance.
POSTED BY: sean roubion
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Girish Arabale
Girish Arabale
Posted 11 years ago
You can write- 
In[4]:= b = ReplaceList[Take[a[[1]], {90, 105}], {x__, ___} -> 0]

Out[4]= {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}
And then,
Join[Take[a[[1]], 89], b, Take[a[[1]], {106, 193}]]
to get the list.
POSTED BY: Girish Arabale
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