Given n as input, generate a n-by-n matrix 'O' using 0 and 1 .
[1 1 1 1
1 0 0 1
1 0 0 1
1 1 1 1]
three solution, all great.
Make a checkerboard matrix
Convert a vector into a number
Make a run-length companion vector
Get the elements of diagonal and antidiagonal for any m-by-n matrix
Deleting an element in a matrix
Calculate mean value of any pair in a vector.
Draw a 'X'!
Draw a 'N'!
Find all repeated numbers
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