The problem statement is misleading. 'if x' and 'if isequal(x, true)' are different conditions.
Most nonzero elements in row
Get the area codes from a list of phone numbers
Set the array elements whose value is 13 to 0
Concatenate two strings
Vectors counting by 2
Only once: cleaning up your columns
Create incremental spiral WITHOUT USING EVAL or FEVAL
Wayfinding 3 - passed areas
Convert a substructure reference string into a valid definition structure for subsref and subsasgn
Order of things - 3
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