Make the following variable:
(all the numbers from 5 to -5 in increments of -0.2)
Get the area codes from a list of phone numbers
Return the first and last character of a string
Set the array elements whose value is 13 to 0
select the primes of a vector
Find the dimensions of a matrix
02 - Vector Variables 1
06 - Matrix Equations 3
07 - Common functions and indexing 5
07 - Common functions and indexing 1
03 - Matrix Variables 6
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