org.netlib.lapack
Class Ssygs2

java.lang.Object
  extended by org.netlib.lapack.Ssygs2

public class Ssygs2
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 * ======= * * SSYGS2 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')*A*inv(U) or inv(L)*A*inv(L') * * 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` or L'*A*L. * * B must have been previously factorized as U'*U or L*L' by SPOTRF. * * Arguments * ========= * * ITYPE (input) INTEGER * = 1: compute inv(U')*A*inv(U) or inv(L)*A*inv(L'); * = 2 or 3: compute U*A*U' or L'*A*L. * * UPLO (input) CHARACTER * Specifies whether the upper or lower triangular part of the * symmetric matrix A is stored, and how B has been factorized. * = 'U': Upper triangular * = 'L': Lower triangular * * N (input) INTEGER * The order of the matrices A and B. N >= 0. * * A (input/output) REAL 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) REAL array, dimension (LDB,N) * The triangular factor from the Cholesky factorization of B, * as returned by SPOTRF. * * 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
Ssygs2()
           
 
Method Summary
static void ssygs2(int itype, java.lang.String uplo, int n, float[] a, int _a_offset, int lda, float[] 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

Ssygs2

public Ssygs2()
Method Detail

ssygs2

public static void ssygs2(int itype,
                          java.lang.String uplo,
                          int n,
                          float[] a,
                          int _a_offset,
                          int lda,
                          float[] b,
                          int _b_offset,
                          int ldb,
                          intW info)