org.netlib.lapack
Class Dspgst

java.lang.Object
  org.netlib.lapack.Dspgst

public class Dspgst
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
 *  =======
 *
 *  DSPGST reduces a real symmetric-definite generalized eigenproblem
 *  to standard form, using packed storage.
 *
 *  If ITYPE = 1, the problem is A*x = lambda*B*x,
 *  and A is overwritten by inv(U**T)*A*inv(U) or inv(L)*A*inv(L**T)
 *
 *  If ITYPE = 2 or 3, the problem is A*B*x = lambda*x or
 *  B*A*x = lambda*x, and A is overwritten by U*A*U**T or L**T*A*L.
 *
 *  B must have been previously factorized as U**T*U or L*L**T by DPPTRF.
 *
 *  Arguments
 *  =========
 *
 *  ITYPE   (input) INTEGER
 *          = 1: compute inv(U**T)*A*inv(U) or inv(L)*A*inv(L**T);
 *          = 2 or 3: compute U*A*U**T or L**T*A*L.
 *
 *  UPLO    (input) CHARACTER
 *          = 'U':  Upper triangle of A is stored and B is factored as
 *                  U**T*U;
 *          = 'L':  Lower triangle of A is stored and B is factored as
 *                  L*L**T.
 *
 *  N       (input) INTEGER
 *          The order of the matrices A and B.  N >= 0.
 *
 *  AP      (input/output) DOUBLE PRECISION array, dimension (N*(N+1)/2)

 *          On entry, the upper or lower triangle of the symmetric matrix
 *          A, packed 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)*(2n-j)/2) = A(i,j) for j<=i<=n.
 *
 *          On exit, if INFO = 0, the transformed matrix, stored in the
 *          same format as A.
 *
 *  BP      (input) DOUBLE PRECISION array, dimension (N*(N+1)/2)
 *          The triangular factor from the Cholesky factorization of B,
 *          stored in the same format as A, as returned by DPPTRF.
 *
 *  INFO    (output) INTEGER
 *          = 0:  successful exit
 *          < 0:  if INFO = -i, the i-th argument had an illegal value
 *
 *  =====================================================================
 *
 *     .. Parameters ..

Constructor Summary

Dspgst()

Method Summary

static void

dspgst(int itype, java.lang.String uplo, int n, double[] ap, int _ap_offset, double[] bp, int _bp_offset, intW info)

Methods inherited from class java.lang.Object

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

Constructor Detail

Dspgst

public Dspgst()

Method Detail

dspgst

public static void dspgst(int itype,
                          java.lang.String uplo,
                          int n,
                          double[] ap,
                          int _ap_offset,
                          double[] bp,
                          int _bp_offset,
                          intW info)