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D.12.7.3 varsigns
Procedure from library rootsur.lib (see rootsur_lib).
- Usage:
- varsigns(l); list l.
- Return:
- int: the number of sign changes in the list l
Example:
| LIB "rootsur.lib";
ring r = 0,x,dp;
list l = 1,2,3;
varsigns(l);
==> 0
l = 1,-1,2,-2,3,-3;
varsigns(l);
==> 5
| See also:
boundposDes.
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