NAME

zrotg - Construct a Given’s plane rotation

SYNOPSIS

SUBROUTINE ZROTG (A, B, C, S)

void zrotg(doublecomplex ∗ca, doublecomplex ∗cb, double ∗
c, doublecomplex ∗s)

COMPLEX∗16    A, B, S
DOUBLE PRECISION       C

PURPOSE

ZROTG - Construct a Given’s plane rotation that will annihilate an element of a vector. 
 

PARAMETERS

A      - COMPLEX∗16. 
On entry, A contains the entry in the first vector that corresponds to the element to be annihilated in the second vector. Unchanged on exit.

B      - COMPLEX∗16. 
On entry, B contains the entry to be annihilated in the second vector.

C      - DOUBLE PRECISION. 
On exit, C and S are the elements of the rotation matrix that will be applied to annihilate B.

S      - COMPLEX∗16. 
On exit, C and S are the elements of the rotation matrix that will be applied to annihilate B.

Sun, Inc.  —  Last change: 20 Sep 1996