Cut vector into many new vectors with defined lengths
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I have a very long vector that I would like to cut up into new vectors of a specified length (400).
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Star Strider
2015-5-29
The easiest way to do what you want would be to use the mat2cell command. For instance, if you wanted to divide it into segments of lengths of [100, 150, 50, 25, 75]:
V = randi(99, 1, 400);
Vs = mat2cell(V, 1, [100, 150, 50, 25, 75]);
Vs4 = Vs{4}; % Addressing Cell #4
Here, ‘Vs’ is a (1x5) cell, and ‘Vs4’ is a (1x25) double.
2 个评论
Joseph Cheng
2015-5-29
or depending on your implementation and how you want to use it, reshape may work out and instead of a 1xN vector you'll then make it 400xN/400 matrix where each column is your "new" vector
Walter Roberson
2015-5-29
Remember that reshape goes down rows, so you might want to transpose:
Vmat = reshape(V, 400, []).';
Reshape will require that the vector be an exact multiple of the target size (400).
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Walter Roberson
2015-5-29
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If you have the signal processing toolkit, you may wish to use buffer(), which is like reshape() but will zero-pad the final vector if necessary to make it fit. Also, buffer() can do overlapping.
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