ssyr2k - perform one of the symmetric rank 2k operations C := alpha*A*B' + alpha*B*A' + beta*C or C := alpha*A'*B + alpha*B'*A + beta*C
SUBROUTINE SSYR2K(UPLO, TRANSA, N, K, ALPHA, A, LDA, B, LDB, BETA, C, LDC) CHARACTER*1 UPLO, TRANSA INTEGER N, K, LDA, LDB, LDC REAL ALPHA, BETA REAL A(LDA,*), B(LDB,*), C(LDC,*) SUBROUTINE SSYR2K_64(UPLO, TRANSA, N, K, ALPHA, A, LDA, B, LDB, BETA, C, LDC) CHARACTER*1 UPLO, TRANSA INTEGER*8 N, K, LDA, LDB, LDC REAL ALPHA, BETA REAL A(LDA,*), B(LDB,*), C(LDC,*) F95 INTERFACE SUBROUTINE SYR2K(UPLO, TRANSA, N, K, ALPHA, A, LDA, B, LDB, BETA, C, LDC) CHARACTER(LEN=1) :: UPLO, TRANSA INTEGER :: N, K, LDA, LDB, LDC REAL :: ALPHA, BETA REAL, DIMENSION(:,:) :: A, B, C SUBROUTINE SYR2K_64(UPLO, TRANSA, N, K, ALPHA, A, LDA, B, LDB, BETA, C, LDC) CHARACTER(LEN=1) :: UPLO, TRANSA INTEGER(8) :: N, K, LDA, LDB, LDC REAL :: ALPHA, BETA REAL, DIMENSION(:,:) :: A, B, C C INTERFACE #include <sunperf.h> void ssyr2k(char uplo, char transa, int n, int k, float alpha, float *a, int lda, float *b, int ldb, float beta, float *c, int ldc); void ssyr2k_64(char uplo, char transa, long n, long k, float alpha, float *a, long lda, float *b, long ldb, float beta, float *c, long ldc);
Oracle Solaris Studio Performance Library ssyr2k(3P) NAME ssyr2k - perform one of the symmetric rank 2k operations C := alpha*A*B' + alpha*B*A' + beta*C or C := alpha*A'*B + alpha*B'*A + beta*C SYNOPSIS SUBROUTINE SSYR2K(UPLO, TRANSA, N, K, ALPHA, A, LDA, B, LDB, BETA, C, LDC) CHARACTER*1 UPLO, TRANSA INTEGER N, K, LDA, LDB, LDC REAL ALPHA, BETA REAL A(LDA,*), B(LDB,*), C(LDC,*) SUBROUTINE SSYR2K_64(UPLO, TRANSA, N, K, ALPHA, A, LDA, B, LDB, BETA, C, LDC) CHARACTER*1 UPLO, TRANSA INTEGER*8 N, K, LDA, LDB, LDC REAL ALPHA, BETA REAL A(LDA,*), B(LDB,*), C(LDC,*) F95 INTERFACE SUBROUTINE SYR2K(UPLO, TRANSA, N, K, ALPHA, A, LDA, B, LDB, BETA, C, LDC) CHARACTER(LEN=1) :: UPLO, TRANSA INTEGER :: N, K, LDA, LDB, LDC REAL :: ALPHA, BETA REAL, DIMENSION(:,:) :: A, B, C SUBROUTINE SYR2K_64(UPLO, TRANSA, N, K, ALPHA, A, LDA, B, LDB, BETA, C, LDC) CHARACTER(LEN=1) :: UPLO, TRANSA INTEGER(8) :: N, K, LDA, LDB, LDC REAL :: ALPHA, BETA REAL, DIMENSION(:,:) :: A, B, C C INTERFACE #include <sunperf.h> void ssyr2k(char uplo, char transa, int n, int k, float alpha, float *a, int lda, float *b, int ldb, float beta, float *c, int ldc); void ssyr2k_64(char uplo, char transa, long n, long k, float alpha, float *a, long lda, float *b, long ldb, float beta, float *c, long ldc); PURPOSE ssyr2k performs one of the symmetric rank 2k operations C := alpha*A*B' + alpha*B*A' + beta*C or C := alpha*A'*B + alpha*B'*A + beta*C where alpha and beta are scalars, C is an n by n symmetric matrix and A and B are n by k matrices in the first case and k by n matrices in the second case. ARGUMENTS UPLO (input) On entry, UPLO specifies whether the upper or lower triangular part of the array C is to be referenced as follows: UPLO = 'U' or 'u' Only the upper triangular part of C is to be referenced. UPLO = 'L' or 'l' Only the lower triangular part of C is to be referenced. Unchanged on exit. TRANSA (input) On entry, TRANSA specifies the operation to be performed as follows: TRANSA = 'N' or 'n' C := alpha*A*B' + alpha*B*A' + beta*C. TRANSA = 'T' or 't' C := alpha*A'*B + alpha*B'*A + beta*C. TRANSA = 'C' or 'c' C := alpha*A'*B + alpha*B'*A + beta*C. Unchanged on exit. N (input) On entry, N specifies the order of the matrix C. N must be at least zero. Unchanged on exit. K (input) On entry with TRANSA = 'N' or 'n', K specifies the number of columns of the matrices A and B, and on entry with TRANSA = 'T' or 't' or 'C' or 'c', K specifies the number of rows of the matrices A and B. K must be at least zero. Unchanged on exit. ALPHA (input) On entry, ALPHA specifies the scalar alpha. Unchanged on exit. A (input) REAL array of DIMENSION ( LDA, ka ), where ka is k when TRANSA = 'N' or 'n', and is n otherwise. Before entry with TRANSA = 'N' or 'n', the leading n by k part of the array A must contain the matrix A, otherwise the leading k by n part of the array A must contain the matrix A. Unchanged on exit. LDA (input) On entry, LDA specifies the first dimension of A as declared in the calling (sub) program. When TRANSA = 'N' or 'n' then LDA must be at least max( 1, n ), otherwise LDA must be at least max( 1, k ). Unchanged on exit. B (input) REAL array of DIMENSION ( LDB, kb ), where kb is k when TRANSA = 'N' or 'n', and is n otherwise. Before entry with TRANSA = 'N' or 'n', the leading n by k part of the array B must contain the matrix B, otherwise the leading k by n part of the array B must contain the matrix B. Unchanged on exit. LDB (input) On entry, LDB specifies the first dimension of B as declared in the calling (sub) program. When TRANSA = 'N' or 'n' then LDB must be at least max( 1, n ), otherwise LDB must be at least max( 1, k ). Unchanged on exit. BETA (input) On entry, BETA specifies the scalar beta. Unchanged on exit. C (input/output) REAL array of DIMENSION ( LDC, n ). Before entry with UPLO = 'U' or 'u', the leading n by n upper triangular part of the array C must contain the upper triangular part of the symmetric matrix and the strictly lower triangular part of C is not referenced. On exit, the upper triangular part of the array C is overwritten by the upper triangular part of the updated matrix. Before entry with UPLO = 'L' or 'l', the leading n by n lower triangular part of the array C must contain the lower triangular part of the symmetric matrix and the strictly upper triangular part of C is not referenced. On exit, the lower triangular part of the array C is overwritten by the lower triangular part of the updated matrix. LDC (input) On entry, LDC specifies the first dimension of C as declared in the calling (sub) program. LDC must be at least max( 1, n ). Unchanged on exit. 7 Nov 2015 ssyr2k(3P)