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D.12.7.15 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.
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