MATLAB: How to format vector as matrix

vector2matrix

I have a long row vector say,v=[1 2 3 … 100]. I'm in need to convert it into a matrix m=[1 2 3 4 5;6 7 8 9 10; ….. ;96 97 98 99 100] i.e),for each row 5 elements…Is it possible in matlab? if so how???

Best Answer

m = reshape(v, 5, []) .' ;

Notice this first creates columns of 5 and then transposes so they become rows, rather than creating rows of 5 directly. This has to do with the order that reshape() takes elements to be reshaped.

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MATLAB: How to Create a 5×5 matrix whose rows are (1:5)

You can do that with simple vector multiplication:

A = ones(5, 1) * (1:5);

MATLAB: Line and column of the minimun element of a matrix

m = [5 1 -400; ...
    -6 100 -6;
     2  5  25];
[~, ind]   = min(m(:));
[row, col] = ind2sub(size(m), ind)

Or:

[v, ind1] = min(m, [], 1);  % Along 1st dimension
[~, col]  = min(v, [], 2);  % Along 2nd dimension
row       = ind1(col)

Best Answer

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MATLAB: How to Create a 5×5 matrix whose rows are (1:5)

MATLAB: Line and column of the minimun element of a matrix

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