Add tests with 100,1000...
Solutions with ceil are wrong.
function out = HowManyDigits(in)
out = floor(log10(in))+1;
Read a column of numbers and interpolate missing data
Replace NaNs with the number that appears to its left in the row.
Back to basics 21 - Matrix replicating
Replicate elements in vectors
find the roots of a quadratic equation
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