MATLAB: Wrap cell values in single quote so that regexprep works

regexprepsingle quotessprintf

My data has strings and digits. It looks something like:
C =
     {'N',[0],'Y',[75];
     'Y', '75', '0','N'}
When I run
C = regexprep(C,'N','99');
I get 'Error using regexprep: All cells must be strings.'
So, I thought I should wrap everything that isn't a string in single quotes.
I tried:
    for i = 1:length(C); 
        if ~isstr(C{i});
        C{i}= sprintf('%d', C{[i]});
    end
But it doesnt work. When i change {1} to {1,3} everything that wasn't a string in column 3 becomes a string, but this is inefficient because my data has >600 columns.
What can I do?
Thank you so much for your time and help!

Best Answer

How about:
C = cellfun(@(x)num2str(x),C,'uni',false)
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