Add tests with 100,1000...
Solutions with ceil are wrong.
function out = HowManyDigits(in)
out = floor(log10(in))+1;
Find all elements less than 0 or greater than 10 and replace them with NaN
Getting the row and column location from a matrix
03 - Matrix Variables 5
06 - Matrix Equations 2
Side of an equilateral triangle
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