|
D.12.7.10 sturm
Procedure from library rootsur.lib (see rootsur_lib).
- Usage:
- sturm(p,a,b); poly p, number a,b
- Return:
- int: the number of real roots of p in (a,b]
- Assume:
- p is a univariate polynomial with rational coefficients,
a, b are rational numbers with a < b
Example:
| LIB "rootsur.lib";
ring r = 0,x,dp;
poly p = (x+2)*(x-1)*(x-5);
sturm(p,-3,6);
==> 3
p = p*(x2+1);
sturm(p,-3,6);
==> 3
p = p*(x+2);
sturm(p,-3,6);
==> 3
| See also:
allreal;
allrealst;
sturmha.
|