drotg - Construct a Given's plane rotation
SUBROUTINE DROTG(A, B, C, S) DOUBLE PRECISION A, B, C, S SUBROUTINE DROTG_64(A, B, C, S) DOUBLE PRECISION A, B, C, S F95 INTERFACE SUBROUTINE ROTG(A, B, C, S) REAL(8) :: A, B, C, S SUBROUTINE ROTG_64(A, B, C, S) REAL(8) :: A, B, C, S C INTERFACE #include <sunperf.h> void drotg(double *a, double *b, double *c, double *s); void drotg_64(double *a, double *b, double *c, double *s);
Oracle Solaris Studio Performance Library drotg(3P) NAME drotg - Construct a Given's plane rotation SYNOPSIS SUBROUTINE DROTG(A, B, C, S) DOUBLE PRECISION A, B, C, S SUBROUTINE DROTG_64(A, B, C, S) DOUBLE PRECISION A, B, C, S F95 INTERFACE SUBROUTINE ROTG(A, B, C, S) REAL(8) :: A, B, C, S SUBROUTINE ROTG_64(A, B, C, S) REAL(8) :: A, B, C, S C INTERFACE #include <sunperf.h> void drotg(double *a, double *b, double *c, double *s); void drotg_64(double *a, double *b, double *c, double *s); PURPOSE drotg Construct a Given's plane rotation that will annihilate an ele- ment of a vector. ARGUMENTS A (input/output) On entry, A contains the entry in the first vector that cor- responds to the element to be annihilated in the second vec- tor. On exit, contains the nonzero element of the rotated vector. B (input/output) On entry, B contains the entry to be annihilated in the sec- ond vector. On exit, contains either S or 1/C depending on which of the input values of A and B is larger. C (output) On exit, C and S are the elements of the rotation matrix that will be applied to annihilate B. S (output) See the description of C. 7 Nov 2015 drotg(3P)