|  |  D.12.8.3 varsigns Procedure from libraryrootsur.lib(see  rootsur_lib).
 
Example:Usage:
varsigns(l); list l.
Return:
int: the number of sign changes in the list l
 See also:
 boundposDes.|  | 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
 | 
 
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