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.
Test for balanced parentheses
What number has this problem?
Sum of odd numbers in a matrix
Remove the Zero
Matlab Basics - Rounding I
Matlab Basics II - 3 Dimensional Arrays
Matlab Basics - Rounding II
Matlab Basics II - Minimum
Matlab Basics - Set unwanted parts of a vector to zero
Matlab Basics - Rounding III
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