3.287. __nv_rnorm4d

double @__nv_rnorm4d(double %a, double %b, double %c, double %d)

Calculate the reciprocal square root of the sum of squares of four coordinates of argument.

Calculate reciprocal of the length of four dimensional vector p in euclidean space undue overflow or underflow.

Note

For accuracy information, see the CUDA C++ Programming Guide, Mathematical Functions Appendix, Double-Precision Floating-Point Functions section.

Returns

Returns inverted length of the 3D vector \(\sqrt{p.x^2+p.y^2+p.z^2+p.t^2}\). If the correct value would overflow, returns \(+\infty\). If the correct value would underflow, returns 0. If two of the input arguments is 0, returns remaining argument