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.
First non-zero element in each column
Back to basics 9 - Indexed References
Column norms of a matrix
Append two matrix as shown below example
Find out sum of all elements of given Matrix
Replace every 3rd element in a vector with 4
Matlab Basics II - 3 Dimensional Arrays
Matlab Basics - Convert a row vector to a column vector
Matlab Basics - Rounding III
Matlab Basics II - Velocity of a particle
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