Calculate the mean of corner elements of a matrix.
e.g. a=[1 2 3;
4 5 6;
7 8 9;]
Mean = (1+3+7+9)/4 = 5
Generate a vector like 1,2,2,3,3,3,4,4,4,4
07 - Common functions and indexing 3
Multiply by 3
Find and replaces spaces from a input string with *
Create a matrix with difference of each row of input matrix
Matrix multiplication across rows
Back to basics - array operations
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