MATLAB: Change variable name in a loop

evalname variavle

Hi,

I have a problem with naming a variable during a for loop. I want to change the variable name in each iteration, so I use eval function for naming like this

dataset=rand(3);

for i=1:N

eval(['NAME_' num2str(i) '=dataset']);

end

But with eval function I always have out put on command window. Does anyone knows better solution for naming or not to show the output of eval function?

Thanks,

Best Answer

http://matlab.wikia.com/wiki/FAQ#How_can_I_create_variables_A1.2C_A2.2C....2CA10_in_a_loop.3F

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: I can’t request user sting input

Since the names may be different lengths name needs to be a cell array. Try name{i} instead of name(i).

Best Answer

Related Solutions

MATLAB: Concatenate arrays within a loop,

MATLAB: I can’t request user sting input

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