org.netlib.lapack
Class Sgetri

java.lang.Object
  org.netlib.lapack.Sgetri

public class Sgetri
extends java.lang.Object

Following is the description from the original
Fortran source.  For each array argument, the Java
version will include an integer offset parameter, so
the arguments may not match the description exactly.
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 _a_offset, int lda, int[] ipiv, int _ipiv_offset, float[] work, int _work_offset, 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 _a_offset,
                          int lda,
                          int[] ipiv,
                          int _ipiv_offset,
                          float[] work,
                          int _work_offset,
                          int lwork,
                          intW info)