Return double factorial
n(n-2)...(5)(3)(1), n>0, odd
n!! = n(n-2)...(6)(4)(2), n>0, even
1 , n = -1, or n = 0
6!! = (6)(4)(2) = 48
Neither n = -1, nor n = 0 are tested.
Find relatively common elements in matrix rows
Multiply a column by a row
Create a vector whose elements depend on the previous element
Draw a 'Z'.
Repeat string n times - 3
Delete the rows in the middle
Bridge and Torch Problem - Probability
Calculate trends in time series
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