MATLAB: How to extract a vector from a matrix and save in workspace

extractingloopingMATLABmatrixmatrix manipulationvectors

Hi all, so I have a matrix, for example:

M = [2 5 8

3 6 9

4 7 10]

I want to extract each column vector [2; 3; 4] and save them with names like: vector_1, vector_2… and so forth

Is it possible? and if so, can I use them in a loop using their names?

like this (totally wrong)

for i = 1: quantity of vectors

vector_1…..

Is it possible?

Thank you in advance

Best Answer

"can I use them in a loop using their names" NO

but you can loop over the columns of the matrix

for jj = 1 : size( M, 1 )
    M( :, jj ) 
end

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Hi Peter

Finding it a little difficult to totally grasp what you want to do e.g. m is a 3d matrix & not a 2d one, right?

My take is that you want to access the 3d-diagonals [e.g. (10,4,10),(9,4,9),(8,4,8) ] of a matrix

The code below will do this - the columns of "m" below being the required 3d-diag vectors of "M", which can then be flipped if the order is not what you required.

M = rand(10,10,10); our starting 3d matrix
M_p = permute(M,[1 3 2]); % 3-d rotation
A = eye(10); A = repmat(A,[1,1,10]); % 3d identity for logical indexing 
m = M_p(A==1); % extract the 3d-diagonal elements of the M_p rotation
m = reshape(m,10,10); % convert single vector to matrix whose columns are the required "3d diagonal-vectors"

If it is necessary that the vectors begin at 10 (i.e. i=10:-1:1 & k=10;-1:1) then use flipud and fliplr as appropriate

m = fliplr(flipud(m));

Is this what you were looking for?

Best Rgds,

Mark

MATLAB: Load() into workspace

Why don't you use textread or textscan or fscanf?

doc textread
doc textscan
doc fscanf

You can control the type of variables and furthermore you can even read the data with different delimiters.

Best Answer

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MATLAB: How to store matrix values in a vector

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