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D.12.8.15 nrroots

Procedure from library rootsur.lib (see rootsur_lib).

Usage:
nrroots(p); poly p

Return:
int: the number of real roots of p

Example:
 
LIB "rootsur.lib";
ring r = 0,x,dp;
poly p = (x+2)*(x-1)*(x-5);
nrroots(p);
==> 3
p = p*(x2+1);
nrroots(p);
==> 3
See also: boundposDes; sturm; sturmha.