I think you try to get the "i" and "j" that the function nonzeros does not give:
Thanks José, I've fixed bugs.
"0" and not "false"... nice shot!
Tell me the slope
Hackathon: the beginnings
Matrix indexing with two vectors of indices
Rounding off numbers to n decimals
length of a vector
Don't Try, give up and return NaN.
Pernicious Anniversary Problem
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