GNU/Linux man pages
Livre :
Expressions régulières,
Syntaxe et mise en oeuvre :
GNU/Linux |
CentOS 4.8 |
i386 |
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clagtm(l) |
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CLAGTM - perform a matrix-vector product of the form B := alpha * A * X + beta * B where A is a tridiagonal matrix of order N, B and X are N by NRHS matrices, and alpha and beta are real scalars, each of which may be 0., 1., or -1
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SUBROUTINE CLAGTM( |
TRANS, N, NRHS, ALPHA, DL, D, DU, X, LDX, BETA, B, LDB ) | ||
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CHARACTER |
TRANS | ||
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INTEGER |
LDB, LDX, N, NRHS | ||
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REAL |
ALPHA, BETA | ||
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COMPLEX |
B( LDB, * ), D( * ), DL( * ), DU( * ), X( LDX, * ) |
CLAGTM performs a matrix-vector product of the form B := alpha * A * X + beta * B where A is a tridiagonal matrix of order N, B and X are N by NRHS matrices, and alpha and beta are real scalars, each of which may be 0., 1., or -1.
TRANS (input) CHARACTER
Specifies the operation applied
to A. = ’N’: No transpose, B := alpha * A * X +
beta * B
= ’T’: Transpose, B := alpha * A**T * X + beta *
B
= ’C’: Conjugate transpose, B := alpha * A**H *
X + beta * B
N (input) INTEGER
The order of the matrix A. N >= 0.
NRHS (input) INTEGER
The number of right hand sides, i.e., the number of columns of the matrices X and B.
ALPHA (input) REAL
The scalar alpha. ALPHA must be 0., 1., or -1.; otherwise, it is assumed to be 0.
DL (input) COMPLEX array, dimension (N-1)
The (n-1) sub-diagonal elements of T.
D (input) COMPLEX array, dimension (N)
The diagonal elements of T.
DU (input) COMPLEX array, dimension (N-1)
The (n-1) super-diagonal elements of T.
X (input) COMPLEX array, dimension (LDX,NRHS)
The N by NRHS matrix X. LDX (input) INTEGER The leading dimension of the array X. LDX >= max(N,1).
BETA (input) REAL
The scalar beta. BETA must be 0., 1., or -1.; otherwise, it is assumed to be 1.
B (input/output) COMPLEX array, dimension (LDB,NRHS)
On entry, the N by NRHS matrix B. On exit, B is overwritten by the matrix expression B := alpha * A * X + beta * B.
LDB (input) INTEGER
The leading dimension of the array B. LDB >= max(N,1).
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clagtm(l) | |