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sgetrs (3)
  • >> sgetrs (3) ( Solaris man: Библиотечные вызовы )
  • 
    NAME
         sgetrs - solve a system of linear equations  A * X = B or A'
         * X = B with a general N-by-N matrix A using the LU factori-
         zation computed by SGETRF
    
    SYNOPSIS
         SUBROUTINE SGETRS( TRANS, N, NRHS, A,  LDA,  IPIV,  B,  LDB,
                   INFO )
    
         CHARACTER TRANS
    
         INTEGER INFO, LDA, LDB, N, NRHS
    
         INTEGER IPIV( * )
    
         REAL A( LDA, * ), B( LDB, * )
    
    
    
         #include <sunperf.h>
    
         void sgetrs(char trans, int n, int nrhs, float *sa, int lda,
                   int *ipivot, float *sb, int ldb, int *info) ;
    
    PURPOSE
         SGETRS solves a system of linear equations
            A * X = B  or  A' * X = B with a general N-by-N matrix  A
         using the LU factorization computed by SGETRF.
    
    
    ARGUMENTS
         TRANS     (input) CHARACTER*1
                   Specifies the form of the system of equations:
                   = 'N':  A * X = B  (No transpose)
                   = 'T':  A'* X = B  (Transpose)
                   = 'C':  A'* X = B  (Conjugate  transpose  =  Tran-
                   spose)
    
         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) REAL array, dimension (LDA,N)
                   The factors L and U from  the  factorization  A  =
                   P*L*U as computed by SGETRF.
    
         LDA       (input) INTEGER
                   The leading dimension of  the  array  A.   LDA  >=
                   max(1,N).
    
         IPIV      (input) INTEGER array, dimension (N)
                   The pivot indices from SGETRF; for 1<=i<=N, row  i
                   of the matrix was interchanged with row IPIV(i).
    
         B         (input/output) REAL 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 ille-
                   gal value
    
    
    
    


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