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RealRoots :: variations(List)

variations(List)

Synopsis

Description

This computes the number of changes of sign in a sequence l

i1 : L = for i to 10 list random(-50,50)

o1 = {-26, 15, 21, 22, -31, -31, 41, 22, 43, 29, 22}

o1 : List
i2 : variations(L)

o2 = 3