MATLAB: Taking frequency of a signal portrayed as a 1D-array

arrayduranfrequency

I have a signal portrayed as a 1D-array(2500002 elements) and I want to take its frequency and I have no idea how.

Thanks in advance!

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Best Answer

The fft function will do what you want.

Pay special attention to the code between the top two figures in the documentation.

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MATLAB: Elementwise Multiplication of column of 3D-array with an 1D-array

A 1D vector of size [1, 1, 3] (your B(1, 1, :)) is not the same size as a 1D vector of size [1, 3, 1] (your k), even though they have the same number of elements. You either need to squeeze the singleton dimensions out of your B vector, permute the dimensions of k, or reshape either:

squeeze(B(1,1,:) .* k'               %squeeze returns a column vector, so transpose k
B(1, 1, :) .* permute(k, [1 3 2])    %swap 2nd and 3rd dimension
reshape(B(1, 1, :), 1, []) .* k
B(1, 1, :) .* reshape(k, 1, 1, [])   %same as permute effectively

MATLAB: Averaging the 3D-array

You may want to histogram the 3D array by 3D histogram. There many functions in Matlab central, just search for "N dimensional histogram".

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MATLAB: Elementwise Multiplication of column of 3D-array with an 1D-array

MATLAB: Averaging the 3D-array

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