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Class org.netlib.lapack.Dgetri

java.lang.Object
   |
   +----org.netlib.lapack.Dgetri

public class Dgetri

extends 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
 *  =======
 *
 *  DGETRI computes the inverse of a matrix using the LU factorization
 *  computed by DGETRF.
 *
 *  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) DOUBLE PRECISION array, dimension (LDA,N)
 *          On entry, the factors L and U from the factorization
 *          A = P*L*U as computed by DGETRF.
 *          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 DGETRF; for 1<=i<=N, row i of the
 *          matrix was interchanged with row IPIV(i).
 *
 *  WORK    (workspace/output) DOUBLE PRECISION 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 illegal value
 *          > 0:  if INFO = i, U(i,i) is exactly zero; the matrix is
 *                singular and its inverse could not be computed.
 *
 *  =====================================================================
 *
 *     .. Parameters ..

Dgetri()

dgetri(int, double[], int, int, int[], int, double[], int, int, intW)

 public Dgetri()

 public static void dgetri(int n,
                           double a[],
                           int _a_offset,
                           int lda,
                           int ipiv[],
                           int _ipiv_offset,
                           double work[],
                           int _work_offset,
                           int lwork,
                           intW info)

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