Matrix indexing with two vectors of indices
Fill a zeros matrix
Make a vector of prime numbers
Find the largest number
Given a matrix A (size m x n) create a matrix B which consists of matrix A sorted in descending order by columns and then by rows.
Rearrange the given matrix to have all its zeros climb up to the top of each column - using for loops.
Given a matrix A (size m x n) create a matrix B (size m+2 x n+2) which consists of matrix A surrounded by zeros. See Example below:
Given a matrix A return a vector of the product of the elements in each column using a loop without using prod.
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