MATLAB: Error using eval function

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I am trying simple eval function . But at some times it gets executed fine. Sometimes it gives me the error msg "Error: Unexpected MATLAB expression". Here's the eval function code. I hope i got the syntax correctly. collection is a character array = 'hero','zero','horse','cow'

collection = regexprep(collection,' ',''',''');
eval(['words = {''',collection,'''};']);

Best Answer

Do not use eval() for that.

words = regexp(collection, '\s+', 'split');

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Eval is evil ( https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval ) , you just need sprintf() .

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Try wrapping your script for extracting Data from a File into a function called getFileData.

function Data = getFileData(File)
    %Temporary variables can be created here.
    Data = ......; %Do something to get Data from your File. 
end %Temporary variables are cleared automatically!

Then in your script, fill up your structure S with data.

FileNames = {'file1.txt', 'file2.txt'};
S(1:length(FileNames)) = struct('Data', []); %Preallocate
for j = 1:length(FileNames)
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The only variables in the workspace will be S and FileNames.

Use clear or clearvars rarely because it's hard to track variables you want to keep/remove when modifying codes, and you could accidentally delete variables.

If you want to access the jth data, use S(j).Data, which is MUCH BETTER than something like S.(['File' num2str(j)]).

Best Answer

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