org.netlib.lapack
Class Sspgst

java.lang.Object
  org.netlib.lapack.Sspgst

public class Sspgst
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
 *  =======
 *
 *  SSPGST 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 SPPTRF.
 *
 *  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) REAL 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) REAL 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 SPPTRF.
 *
 *  INFO    (output) INTEGER
 *          = 0:  successful exit
 *          < 0:  if INFO = -i, the i-th argument had an illegal value
 *
 *  =====================================================================
 *
 *     .. Parameters ..

Constructor Summary

Sspgst()

Method Summary

static void

sspgst(int itype, java.lang.String uplo, int n, float[] ap, int _ap_offset, float[] 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

Sspgst

public Sspgst()

Method Detail

sspgst

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