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