rotg: generate plane rotation

Functions
subroutine	crotg (a, b, c, s)
	CROTG generates a Givens rotation with real cosine and complex sine. More...
subroutine	drotg (a, b, c, s)
	DROTG More...
subroutine	srotg (a, b, c, s)
	SROTG More...
subroutine	zrotg (a, b, c, s)
	ZROTG generates a Givens rotation with real cosine and complex sine. More...

Detailed Description