Add tests with 100,1000...
Solutions with ceil are wrong.
function out = HowManyDigits(in)
out = floor(log10(in))+1;
Determine whether a vector is monotonically increasing
Factorize THIS, buddy
Set some matrix elements to zero
Generate a vector like 1,2,2,3,3,3,4,4,4,4
Make a 1 hot vector
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