org.netlib.lapack
Class STPTRI

java.lang.Object
  org.netlib.lapack.STPTRI

public class STPTRI
extends java.lang.Object

STPTRI is a simplified interface to the JLAPACK routine stptri.
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
 *  =======
 *
 *  STPTRI 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) REAL 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

STPTRI()

Method Summary

static void

STPTRI(java.lang.String uplo, java.lang.String diag, int n, float[] ap, intW info)

Methods inherited from class java.lang.Object

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

Constructor Detail

STPTRI

public STPTRI()

Method Detail

STPTRI

public static void STPTRI(java.lang.String uplo,
                          java.lang.String diag,
                          int n,
                          float[] ap,
                          intW info)