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zgetri (3)
  • >> zgetri (3) ( Solaris man: Библиотечные вызовы )
  • 
    NAME
         zgetri - compute the inverse of a matrix using the  LU  fac-
         torization computed by ZGETRF
    
    SYNOPSIS
         SUBROUTINE ZGETRI( N, A, LDA, IPIV, WORK, LWORK, INFO )
    
         INTEGER INFO, LDA, LWORK, N
    
         INTEGER IPIV( * )
    
         COMPLEX*16 A( LDA, * ), WORK( LWORK )
    
    
    
         #include <sunperf.h>
    
         void zgetri(int n, doublecomplex *za, int lda, int  *ipivot,
                   int *info) ;
    
    PURPOSE
         ZGETRI computes the inverse of a matrix using the LU factor-
         ization computed by ZGETRF.
    
         This method inverts U and then computes  inv(A)  by  solving
         the system inv(A)*L = inv(U) for inv(A).
    
    
    ARGUMENTS
         N         (input) INTEGER
                   The order of the matrix A.  N >= 0.
    
         A         (input/output) COMPLEX*16 array, dimension (LDA,N)
                   On entry, the factors L and U from the  factoriza-
                   tion A = P*L*U as computed by ZGETRF.  On exit, if
                   INFO = 0, the inverse of the original matrix A.
    
         LDA       (input) INTEGER
                   The leading dimension of  the  array  A.   LDA  >=
                   max(1,N).
    
         IPIV      (input) INTEGER array, dimension (N)
                   The pivot indices from ZGETRF; for 1<=i<=N, row  i
                   of the matrix was interchanged with row IPIV(i).
    
         WORK      (workspace/output)  COMPLEX*16  array,   dimension
                   (LWORK)
                   On exit,  if  INFO=0,  then  WORK(1)  returns  the
                   optimal LWORK.
    
         LWORK     (input) INTEGER
                   The  dimension  of  the  array  WORK.   LWORK   >=
                   max(1,N).   For optimal performance LWORK >= N*NB,
                   where NB is  the  optimal  blocksize  returned  by
                   ILAENV.
    
         INFO      (output) INTEGER
                   = 0:  successful exit
                   < 0:  if INFO = -i, the i-th argument had an ille-
                   gal value
                   > 0:  if INFO = i, U(i,i)  is  exactly  zero;  the
                   matrix  is  singular  and its inverse could not be
                   computed.
    
    
    
    


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