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.
given 3 sides, find area of this triangle
Sum of diagonal of a square matrix
Whether the input is vector?
Find the nearest integer
sum of first 'n' terms
Matlab Basics - Convert a row vector to a column vector
Matlab Basics II - Free Fall
Matlab Basics - y as a function of x
Replace every 3rd element in a vector with 4
Matlab Basics II - Count rows in a matrix
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