You're *very* close with this one. Remember that r is input as a double, not a string.
Extract leading non-zero digit
Get the area codes from a list of phone numbers
Back to basics 7 - Equal NaNs
Set a diagonal
Make a vector of prime numbers
Muphry's Law of MATLAB
The Hills Are Alive...
Breaking Out of the Matrix
Matrix of Multiplication Facts
Unique dice configurations
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