rotg: generate plane rotation (cf. lartg)

Collaboration diagram for rotg: generate plane rotation (cf. lartg):

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

Detailed Description