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LAPACK
3.7.0
LAPACK: Linear Algebra PACKage
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subroutine sgesc2 | ( | integer | N, |
real, dimension( lda, * ) | A, | ||
integer | LDA, | ||
real, dimension( * ) | RHS, | ||
integer, dimension( * ) | IPIV, | ||
integer, dimension( * ) | JPIV, | ||
real | SCALE | ||
) |
SGESC2 solves a system of linear equations using the LU factorization with complete pivoting computed by sgetc2.
Download SGESC2 + dependencies [TGZ] [ZIP] [TXT]
SGESC2 solves a system of linear equations A * X = scale* RHS with a general N-by-N matrix A using the LU factorization with complete pivoting computed by SGETC2.
[in] | N | N is INTEGER The order of the matrix A. |
[in] | A | A is REAL array, dimension (LDA,N) On entry, the LU part of the factorization of the n-by-n matrix A computed by SGETC2: A = P * L * U * Q |
[in] | LDA | LDA is INTEGER The leading dimension of the array A. LDA >= max(1, N). |
[in,out] | RHS | RHS is REAL array, dimension (N). On entry, the right hand side vector b. On exit, the solution vector X. |
[in] | IPIV | IPIV is INTEGER array, dimension (N). The pivot indices; for 1 <= i <= N, row i of the matrix has been interchanged with row IPIV(i). |
[in] | JPIV | JPIV is INTEGER array, dimension (N). The pivot indices; for 1 <= j <= N, column j of the matrix has been interchanged with column JPIV(j). |
[out] | SCALE | SCALE is REAL On exit, SCALE contains the scale factor. SCALE is chosen 0 <= SCALE <= 1 to prevent owerflow in the solution. |
Definition at line 116 of file sgesc2.f.