MATLAB: A Varying matrix name in loop

MATLABmatrixvariables

I have a loop running from i=1 to N where N is unkown and inputted by the user and the commands in the loop generates a matrix and i would like the first loop to give me matrix1 and the second loopd to give me matrix2 so the matrix name is changed based on the i value, but im not really sure how to go about this problem

Best Answer

N = 10; 
matrix = cell(N,1) ; 
for i = 1:N
    matrix{i} = rand(3) ; 
end

Trust me, there is no meaning in naming as matrix1, matrix2,........ rather you can use the above and call them by

matrix{1}
matrix{2}

This is called cell referencing. Read about cells.

Related Solutions

MATLAB: Concatenate arrays within a loop,

Easy, given any number of arrays in a cell array C. You could use a loop like this, although it is inefficient because the output array is not preallocated:

C = {[1,2],[3,4],...} % cell array of arrays.
A = C{1};
for k = 2:numel(C)
    A = [A;C{k}];
end

Simpler and more efficient would be to concatenate them all at once, without a loop, e.g.:

A = vertcat(C{:})

Whatever you do, do NOT try to access variable names dynamically in a loop! Read this to know why:

https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

Using an array (e.g. a cell array) and indexing is much simpler, neater, much more efficient, less buggy, and easier to debug.

MATLAB: Assign values to symbolic matrix

What you're trying to do is a bad idea ( https://in.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval )

As = cell(n,1);
for k = 1:n
    As{k} = ... your code
end

Best Answer

Related Solutions

MATLAB: Concatenate arrays within a loop,

MATLAB: Assign values to symbolic matrix

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