Solve a quartic polynomial with real coefficients and real roots [abstract base]. More...
#include <poly.h>
Public Member Functions | |
virtual int | solve_r (const double a4, const double b4, const double c4, const double d4, const double e4, double &x1, double &x2, double &x3, double &x4)=0 |
Solves the polynomial ![]() ![]() ![]() ![]() ![]() | |
virtual double | disc_r (const double a, const double b, const double c, const double d, const double e) |
Compute the discriminant. More... | |
const char * | type () |
Return a string denoting the type ("quartic_real") | |
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virtual |
The discriminant is zero if and only if at least two roots are equal. If the discriminant is non-zero, the discriminant is negative if there are two real roots and two complex conjugate roots, and it is positive if the roots are either all real or all non-real.
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