Repeat elements of a vector as matrixes in a multidimensional array.

Hello Everyone.

I want to repeat elements of a vector as matrixes in a multidimensional array. For example, say I have the vector v = [1 2 3 4 5]. Then I want to construct a three dimensional array w of dimension say 4*3*lenght(v) where: w(:,:,1) = v(1), w(:,:,2) = v(2), ... w(:,:,length(v)) = v(end). Is there a way to do this without using a for loop ? Any help would be precious.

Thank you.

Answer 1

[Robert U]

Hi Marius Adom,

If I understood your task correctly, you can use arrayfun() to create each x-y-Matrix and concatenate them using cat():

x = 4;
y = 3;
v = [1 2 3 4 5];

cOut = arrayfun(@(dIn,nInd) ones(x,y) .* dIn, v, 1:length(v), 'UniformOutput',false);
dOut = cat(3,cOut{:});

Kind regards,

Robert

[Idossou Marius Adom]

Hi Robert U.

Thank you very much. It works perfectly as I want it.

Regards.

Answer 2

[James Tursa]

Another way:

m = size of 1st dimension
n = size of 2nd dimension
v = your row vector
result = reshape(repmat(v,m*n,1),m,n,[]);

[Idossou Marius Adom]

Hi James Tursa. Thank you very much. It works too.