Given an array, return the cumulative difference.
a = [ 1 3 5 7 ]
cumdiff = [ 1 2 1 -2 ]
Right and wrong
Getting the indices from a vector
Find Index of maximum Value and maximum Value of a vector
Broken numlock key, oppps !
Back to basics - mean of corner elements of a matrix
Create a v-notch vector without "sort" function
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