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.
Find the numeric mean of the prime numbers in a matrix.
Omit columns averages from a matrix
Compute a dot product of two vectors x and y
Find a subset that divides the vector into equal halves
BASICS - sum part of vector
Draw a 'X'!
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