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.
Increment a number, given its digits
Given a 4x4 matrix, swap the two middle columns
Relative ratio of "1" in binary number
Create a Matrix of Zeros
Matlab Basics II - Extract last 3 elements of a vector
Matlab Basics II - Intervals
Matlab Basics II - Log and natural log
Matlab Basics II - Find the roots of a function
Matlab Basics II - 3 Dimensional Arrays
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