GNU/Linux man pages
Livre :
Expressions régulières,
Syntaxe et mise en oeuvre :
GNU/Linux |
CentOS 4.8 |
i386 |
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dsytrs(l) |
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DSYTRS - solve a system of linear equations A*X = B with a real symmetric matrix A using the factorization A = U*D*U**T or A = L*D*L**T computed by DSYTRF
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SUBROUTINE DSYTRS( |
UPLO, N, NRHS, A, LDA, IPIV, B, LDB, INFO ) | ||
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CHARACTER |
UPLO | ||
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INTEGER |
INFO, LDA, LDB, N, NRHS | ||
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INTEGER |
IPIV( * ) | ||
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DOUBLE |
PRECISION A( LDA, * ), B( LDB, * ) |
DSYTRS solves a system of linear equations A*X = B with a real symmetric matrix A using the factorization A = U*D*U**T or A = L*D*L**T computed by DSYTRF.
UPLO (input) CHARACTER*1
Specifies whether the details
of the factorization are stored as an upper or lower
triangular matrix. = ’U’: Upper triangular, form
is A = U*D*U**T;
= ’L’: Lower triangular, form is A =
L*D*L**T.
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 matrix B. NRHS >= 0.
A (input) DOUBLE PRECISION array, dimension (LDA,N)
The block diagonal matrix D and the multipliers used to obtain the factor U or L as computed by DSYTRF.
LDA (input) INTEGER
The leading dimension of the array A. LDA >= max(1,N).
IPIV (input) INTEGER array, dimension (N)
Details of the interchanges and the block structure of D as determined by DSYTRF.
B (input/output) DOUBLE PRECISION array, dimension (LDB,NRHS)
On entry, the right hand side matrix B. On exit, the solution matrix X.
LDB (input) INTEGER
The leading dimension of the array B. LDB >= max(1,N).
INFO (output) INTEGER
= 0: successful exit
< 0: if INFO = -i, the i-th argument had an illegal
value
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dsytrs(l) | |