Cut vector into many new vectors with defined lengths

I have a very long vector that I would like to cut up into new vectors of a specified length (400).

Answer 1

[Star Strider]

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.

[Joseph Cheng]

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]

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).

Answer 2

[Walter Roberson]

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.

Answer 3

[Kimberly S]

Thank you. reshape works perfectly as long as the vector is divisible by 400, which it is!