org.netlib.lapack
Class Dtptri

java.lang.Object
  org.netlib.lapack.Dtptri

public class Dtptri
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
 *  =======
 *
 *  DTPTRI computes the inverse of a real upper or lower triangular
 *  matrix A stored in packed format.
 *
 *  Arguments
 *  =========
 *
 *  UPLO    (input) CHARACTER*1
 *          = 'U':  A is upper triangular;
 *          = 'L':  A is lower triangular.
 *
 *  DIAG    (input) CHARACTER*1
 *          = 'N':  A is non-unit triangular;
 *          = 'U':  A is unit triangular.
 *
 *  N       (input) INTEGER
 *          The order of the matrix A.  N >= 0.
 *
 *  AP      (input/output) DOUBLE PRECISION array, dimension (N*(N+1)/2)

 *          On entry, the upper or lower triangular matrix A, stored
 *          columnwise in a linear array.  The j-th column of A is stored
 *          in the array AP as follows:
 *          if UPLO = 'U', AP(i + (j-1)*j/2) = A(i,j) for 1<=i<=j;
 *          if UPLO = 'L', AP(i + (j-1)*((2*n-j)/2) = A(i,j) for j<=i<=n.
 *          See below for further details.
 *          On exit, the (triangular) inverse of the original matrix, in

 *          the same packed storage format.
 *
 *  INFO    (output) INTEGER
 *          = 0:  successful exit
 *          < 0:  if INFO = -i, the i-th argument had an illegal value
 *          > 0:  if INFO = i, A(i,i) is exactly zero.  The triangular
 *                matrix is singular and its inverse can not be computed.
 *
 *  Further Details
 *  ===============
 *
 *  A triangular matrix A can be transferred to packed storage using one

 *  of the following program segments:
 *
 *  UPLO = 'U':                      UPLO = 'L':
 *
 *        JC = 1                           JC = 1
 *        DO 2 J = 1, N                    DO 2 J = 1, N
 *           DO 1 I = 1, J                    DO 1 I = J, N
 *              AP(JC+I-1) = A(I,J)              AP(JC+I-J) = A(I,J)
 *      1    CONTINUE                    1    CONTINUE
 *           JC = JC + J                      JC = JC + N - J + 1
 *      2 CONTINUE                       2 CONTINUE
 *
 *  =====================================================================
 *
 *     .. Parameters ..

Constructor Summary

Dtptri()

Method Summary

static void

dtptri(java.lang.String uplo, java.lang.String diag, int n, double[] ap, int _ap_offset, intW info)

Methods inherited from class java.lang.Object

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

Constructor Detail

Dtptri

public Dtptri()

Method Detail

dtptri

public static void dtptri(java.lang.String uplo,
                          java.lang.String diag,
                          int n,
                          double[] ap,
                          int _ap_offset,
                          intW info)