Symmetric band | F_SSBMV/F_DSBMV/F_CSBMV/F_ZSBMV | |
| INTEGER*8 | INCX, INCY, K, LDA, N, UPLO |
| REAL*4 | ALPHA, BETA, A( LDA, * ), X( * ), Y( * ) |
| SUBROUTINE F_SSBMV (UPLO, N, K, ALPHA, A, LDA, X, INCX, BETA, | |
| Y, INCY) |
|
| INTEGER*8 | INCX, INCY, K, LDA, N, UPLO |
| REAL*8 | ALPHA, BETA, A( LDA, * ), X( * ), Y( * ) |
| SUBROUTINE F_DSBMV (UPLO, N, K, ALPHA, A, LDA, X, INCX, BETA, | |
| Y, INCY) |
|
| INTEGER*8 | INCX, INCY, K, LDA, N, UPLO |
| COMPLEX*8 | ALPHA, BETA, A( LDA, * ), X( * ), Y( * ) |
| SUBROUTINE F_CSBMV (UPLO, N, K, ALPHA, A, LDA, X, INCX, BETA, | |
| Y, INCY) |
|
| INTEGER*8 | INCX, INCY, K, LDA, N, UPLO |
| COMPLEX*16 | ALPHA, BETA, A( LDA, * ), X( * ), Y( * ) |
| SUBROUTINE F_ZSBMV (UPLO, N, K, ALPHA, A, LDA, X, INCX, BETA, | |
| Y, INCY) |
|
Input | UPLO | Specifies whether a triangular matrix is upper or lower |
|
| triangular. Use either BLAS_UPPER or BLAS_LOWER. |
| N | Number of columns in matrix A, n > 0. If n ≤ 0 , the |
|
| subprograms do not reference A, X, or Y. |
| K | The number of non zero diagonals above or below the |
|
| principal diagonal. |
| ALPHA | The scalar ALPHA. If beta = 1 and alpha = 0, this |
|
| routine returns immediately. |
| A | REAL or COMPLEX array, dimension (LDA, N). |
| LDA | Leading dimension of array A. If lda < 1 or lda < k+1, |
|
| an error condition is generated. |
| X | REAL or COMPLEX array, minimum length |
|
| N - 1) x incx + 1. |
| INCX | Increment for the array x. A vector x having component |
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| xi, i = 1,..., n, is stored in an array X() with increment |
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| argument incx. If incx > 0 then xi is stored in |
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| X (1 + (i - 1) x incx). If incx < 0 then xiis stored in |
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| X (1 + (N - i) x incx). incx = 0 is an illegal value. |
| BETA | The scalar BETA. If beta = 1 and alpha = 0, this |
|
| routine returns immediately. |
Chapter 3 Basic Matrix Operations 379