MATLAB: Using the int i as output name

dynamic variable namesevalfor loop

Hi,everyone.I would like to ask a question about using the int i as output name , I hope someone could help me . such as for i=1:30; I have a function I would like to put 30 different input using for loop . just like input (i)=xxx ->my program->output (i)=xxxx I would like to have 30 input(some audio files 1.wav 2.wav 3.wav …………) and 30 output , output 1 output 2 output 3……, I have tried output(int i) that's not works , also int2str(i) not working too. could anyone tell me how to do that , thanks a lot .

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: Outputting to string

You can do this using the function EVAL:

for i = 1:3
  eval(['var_' int2str(i) ' = fcn(i);']);
end

But in general an easier approach is to store your outputs in a cell array instead of a bunch of variables:

outputArray = cell(1,3);
for i = 1:3
  outputArray{i} = fcn(i);
end

This makes it much easier to access the data later since you can just index into the cell array to get its contents, whereas for the first approach you would likely have to reconstruct a variable name and use EVAL again later to access the data stored in a particular variable.

Best Answer

Related Solutions

MATLAB: Concatenate arrays within a loop,

MATLAB: Outputting to string

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