From a usability point of view, returning a string to indicate nothing found is probably the worst. an empty value or 0 would be much better.
Guillaume, I would say that that depends upon the intended 'audience' for the output.
Make a checkerboard matrix
Getting the absolute index from a matrix
Back to basics - mean of corner elements of a matrix
Reverse a matrix
Sum of series II
Matlab Basics II - Find the roots of a function
Matlab Basics II - squares
Matlab Basics II - Max & Index of Max
Matlab Basics II - Free Fall
Matlab Basics - Absolute Value
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