org.netlib.lapack
Class SGETRI

java.lang.Object
  org.netlib.lapack.SGETRI

public class SGETRI
extends java.lang.Object

SGETRI is a simplified interface to the JLAPACK routine sgetri.
This interface converts Java-style 2D row-major arrays into
the 1D column-major linearized arrays expected by the lower
level JLAPACK routines.  Using this interface also allows you
to omit offset and leading dimension arguments.  However, because
of these conversions, these routines will be slower than the low
level ones.  Following is the description from the original Fortran
source.  Contact seymour@cs.utk.edu with any questions.

 *     ..
 *
 *  Purpose
 *  =======
 *
 *  SGETRI computes the inverse of a matrix using the LU factorization
 *  computed by SGETRF.
 *
 *  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) REAL array, dimension (LDA,N)
 *          On entry, the factors L and U from the factorization
 *          A = P*L*U as computed by SGETRF.
 *          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 SGETRF; for 1<=i<=N, row i of the
 *          matrix was interchanged with row IPIV(i).
 *
 *  WORK    (workspace/output) REAL 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.
 *
 *          If LWORK = -1, then a workspace query is assumed; the routine
 *          only calculates the optimal size of the WORK array, returns
 *          this value as the first entry of the WORK array, and no error
 *          message related to LWORK is issued by XERBLA.
 *
 *  INFO    (output) INTEGER
 *          = 0:  successful exit
 *          < 0:  if INFO = -i, the i-th argument had an illegal value
 *          > 0:  if INFO = i, U(i,i) is exactly zero; the matrix is
 *                singular and its inverse could not be computed.
 *
 *  =====================================================================
 *
 *     .. Parameters ..

Constructor Summary

SGETRI()

Method Summary

static void

SGETRI(int n, float[][] a, int[] ipiv, float[] work, int lwork, intW info)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SGETRI

public SGETRI()

Method Detail

SGETRI

public static void SGETRI(int n,
                          float[][] a,
                          int[] ipiv,
                          float[] work,
                          int lwork,
                          intW info)