For a row vector:
V=[7 1 2 -3]
there is one sign change (from 2 to -3). So, the function you write must return N=1.
For this row vector:
V=[5 9 -2 7];
there are two sign changes, one from 9 to -2 and a second from -2 to 7, thus N=2.
Similarly
V=[-4 -6 -7 -5 -6] and V=[3 7 6 5 6 7 8 7 6]
have no sign changes (N=0).
The problem title and description were cleaned up.
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