Singular Manual: nrroots

| #### 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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