org.netlib.lapack
Class DSYGST

java.lang.Object
  extended by org.netlib.lapack.DSYGST

public class DSYGST
extends java.lang.Object

DSYGST is a simplified interface to the JLAPACK routine dsygst.
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 * ======= * * 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, double[][] b, 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,
                          double[][] b,
                          intW info)