Contents

• NAME
• SYNOPSIS
  • F95 INTERFACE
  • C INTERFACE
• PURPOSE
• ARGUMENTS

NAME

     crotg - Construct a Given's plane rotation

SYNOPSIS

     SUBROUTINE CROTG(A, B, C, S)

     COMPLEX A, B, S
     REAL C

     SUBROUTINE CROTG_64(A, B, C, S)

     COMPLEX A, B, S
     REAL C

  F95 INTERFACE
     SUBROUTINE ROTG(A, B, C, S)

     COMPLEX :: A, B, S
     REAL :: C

     SUBROUTINE ROTG_64(A, B, C, S)

     COMPLEX :: A, B, S
     REAL :: C

  C INTERFACE
     #include <sunperf.h>

     void crotg(complex *a, complex *b, float *c, complex *s);

     void crotg_64(complex *a, complex *b, float *c, complex *s);

PURPOSE

     crotg Construct a Given's plane rotation that  will  annihi-
     late an element of a vector.

ARGUMENTS

     A (input/output)
               On entry, A contains the entry in the first vector
               that  corresponds to the element to be annihilated
               in the  second  vector.   On  exit,  contains  the
               nonzero element of the rotated vector.
     B (input)
               On entry, B contains the entry to  be  annihilated
               in the second vector.  Unchanged on exit.

     C (output)
               On exit, C and S are the elements of the  rotation
               matrix that will be applied to annihilate B.

     S (output)
               On exit, C and S are the elements of the  rotation
               matrix that will be applied to annihilate B.