| private givens_coeffs_sym ( float a_pp, float a_pq, float a_qq, float &c, float &s ) : void | ||
| a_pp | float | |
| a_pq | float | |
| a_qq | float | |
| c | float | |
| s | float | |
| return | void | |
void givens_coeffs_sym(float a_pp, float a_pq, float a_qq, out float c, out float s)
{
if (a_pq == 0.0f)
{
c = 1.0f;
s = 0.0f;
return;
}
float tau = (a_qq - a_pp) / (2.0f * a_pq);
float stt = (float)Math.Sqrt(1.0f + tau * tau);
float tan = 1.0f / ((tau >= 0.0f) ? (tau + stt) : (tau - stt));
c = 1.0f / (float)Math.Sqrt(1.0f + tan * tan);
s = tan * c;
}