MATLAB: Looping through Cell array

cell arrayfor loop

Hi,

I have a cell array of symbols: sym = {'A','B','C'}. I have a function that takes in a symbol (say 'A') and produces a certain result. Right now I am manually feeding in the symbol nmaes to the function. Is there a way to loop through the items of the sym cell array and programatically feed in the symbol names to the function? Thanks

Best Answer

Yes, look up eval() and evalin() functions in the help files. These functions accept strings as inputs and evaluate them as though they were entered on the command line. You may also consider using function handles in the cell array instead of strings if you are changing the function regularly.

Stephen

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What about a trivial FOR loop:

C      = {rand(100, 1), rand(100, 1), rand(100, 1), rand(100, 1)};
value  = 0.5;
row    = cell(1, 3);
column = cell(1, 3);
for i = 1:3
  [row{i}, column{i}] = find(C{1} == value);
end

This can be done by CELLFUN also, but I do not see an advantage.

Or you can create the numerical matrix explicitely and use logical indexing:

Match = find(cat(2, C{1:3}) == value);

Usually using the columns of the logical matrix Match is faster than using separate index vectors.

Best Answer

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