org.netlib.lapack
Class Dsygst

java.lang.Object
  org.netlib.lapack.Dsygst

public class Dsygst
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
 *  =======
 *
 *  DSYGST reduces a real symmetric-definite generalized eigenproblem
 *  to standard form.
 *
 *  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 DPOTRF.
 *
 *  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.
 *
 *  A       (input/output) DOUBLE PRECISION array, dimension (LDA,N)
 *          On entry, the symmetric matrix A.  If UPLO = 'U', the leading
 *          N-by-N upper triangular part of A contains the upper
 *          triangular part of the matrix A, and the strictly lower
 *          triangular part of A is not referenced.  If UPLO = 'L', the
 *          leading N-by-N lower triangular part of A contains the lower

 *          triangular part of the matrix A, and the strictly upper
 *          triangular part of A is not referenced.
 *
 *          On exit, if INFO = 0, the transformed matrix, stored in the
 *          same format as A.
 *
 *  LDA     (input) INTEGER
 *          The leading dimension of the array A.  LDA >= max(1,N).
 *
 *  B       (input) DOUBLE PRECISION array, dimension (LDB,N)
 *          The triangular factor from the Cholesky factorization of B,
 *          as returned by DPOTRF.
 *
 *  LDB     (input) INTEGER
 *          The leading dimension of the array B.  LDB >= max(1,N).
 *
 *  INFO    (output) INTEGER
 *          = 0:  successful exit
 *          < 0:  if INFO = -i, the i-th argument had an illegal value
 *
 *  =====================================================================
 *
 *     .. Parameters ..

Constructor Summary

Dsygst()

Method Summary

static void

dsygst(int itype, java.lang.String uplo, int n, double[] a, int _a_offset, int lda, double[] b, int _b_offset, int ldb, intW info)

Methods inherited from class java.lang.Object

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

Constructor Detail

Dsygst

public Dsygst()

Method Detail

dsygst

public static void dsygst(int itype,
                          java.lang.String uplo,
                          int n,
                          double[] a,
                          int _a_offset,
                          int lda,
                          double[] b,
                          int _b_offset,
                          int ldb,
                          intW info)