8ca724fffa
- replaces floating-point equal comparisons in
`linearEqn`, `quadraticEqn`, and `cubicEqn`,
- ensures `quadraticEqn` and `cubicEqn` can return `complex` roots,
- reorders if-branches in `quadraticEqn` and `cubicEqn` to avoid
zero-equal comparison,
- adds Kahan's cancellation-avoiding algorithm into `quadraticEqn` and
`cubicEqn` for the numerically-sensitive discriminant computation,
- adds/improves `polynomialEqns` tests:
* adds Test-linearEqn.C
* adds Test-quadraticEqn.C
* improves Test-cubicEqn.C
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| .. | ||
| cubicEqn | ||
| linearEqn | ||
| quadraticEqn | ||