MATLAB: Inserting a variable in a name of an object

namevariablevariable name

Im using this code

 C = 16
Sample = S1
S1 = Array1;        %Sample1
S2 = Array2;        %Sample2
S3 = Array3;        %Sample3
S4 = Array4;        %Sample4
column16_1 = cellfun(@(m) m(:, C), Sample, 'UniformOutput', false);

Can i change the name of the created array "column16_1" in this way:

columnC_Sample

So what I want is that, if I change the value of "C" and "Sample", I want matlab to automatically create a new name for the new created array.

I hope I made my problem clear enough.

Thanks for the help!

Best Answer

It's possible, but DON'T. You'll be going down a path that is very inefficient, hard to debug, hard to edit, and simply prone to errors.

The proper way is to use a cell array indexed by column number and sample number. (or if all the columns are the same size, simply use plain multidimensional array). Similarly your sample arrays should be stored in a cell array, not in numbered variables:

Sample{1} = Array1; Sample{2} = Array2; Sample{3} = Array3; Sample{4} = Array4;
column{C, S} = cellfun(@(m) m(:, C), Sample{S}, 'UniformOutput', false);

See the FAQ for why it's a bad idea to number variables.

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MATLAB: Concatenating cell arrays with a different number of columns

maxcols = max(cellfun('size', NonC_tRNAs, 2));  %get the number of columns of the widest array
padded = cellfun(@(m) [m, zeros(size(m, 1), maxcols - size(m, 2))], NonC_tRNAs, 'UniformOutput', false);  %pad each array
NonC_tRNAs_Reference  = vertcat(padded{:})

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.

Best Answer

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