Convert the input to a cell array, but only if necessary.
If the input is a numeric array, return a 1-by-1 cell array containing the input. If the input is a cell array of numeric arrays, return the input unaltered.
Encode Roman Numerals
Return the first and last character of a string
CONVERT TAN TO SIN
Compute LOG(1+X) in natural log
Create cell array of strings
Triangular matrices in 3D array
Repeat middle rows and columns of an array
Find last zero for each column
The Python Challenge, Level 1: Decode strings
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