org.netlib.lapack
Class Dtrsyl

java.lang.Object
  org.netlib.lapack.Dtrsyl

public class Dtrsyl
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
 *  =======
 *
 *  DTRSYL solves the real Sylvester matrix equation:
 *
 *     op(A)*X + X*op(B) = scale*C or
 *     op(A)*X - X*op(B) = scale*C,
 *
 *  where op(A) = A or A**T, and  A and B are both upper quasi-
 *  triangular. A is M-by-M and B is N-by-N; the right hand side C and
 *  the solution X are M-by-N; and scale is an output scale factor, set
 *  <= 1 to avoid overflow in X.
 *
 *  A and B must be in Schur canonical form (as returned by DHSEQR), that
 *  is, block upper triangular with 1-by-1 and 2-by-2 diagonal blocks;
 *  each 2-by-2 diagonal block has its diagonal elements equal and its
 *  off-diagonal elements of opposite sign.
 *
 *  Arguments
 *  =========
 *
 *  TRANA   (input) CHARACTER*1
 *          Specifies the option op(A):
 *          = 'N': op(A) = A    (No transpose)
 *          = 'T': op(A) = A**T (Transpose)
 *          = 'C': op(A) = A**H (Conjugate transpose = Transpose)
 *
 *  TRANB   (input) CHARACTER*1
 *          Specifies the option op(B):
 *          = 'N': op(B) = B    (No transpose)
 *          = 'T': op(B) = B**T (Transpose)
 *          = 'C': op(B) = B**H (Conjugate transpose = Transpose)
 *
 *  ISGN    (input) INTEGER
 *          Specifies the sign in the equation:
 *          = +1: solve op(A)*X + X*op(B) = scale*C
 *          = -1: solve op(A)*X - X*op(B) = scale*C
 *
 *  M       (input) INTEGER
 *          The order of the matrix A, and the number of rows in the
 *          matrices X and C. M >= 0.
 *
 *  N       (input) INTEGER
 *          The order of the matrix B, and the number of columns in the
 *          matrices X and C. N >= 0.
 *
 *  A       (input) DOUBLE PRECISION array, dimension (LDA,M)
 *          The upper quasi-triangular matrix A, in Schur canonical form.
 *
 *  LDA     (input) INTEGER
 *          The leading dimension of the array A. LDA >= max(1,M).
 *
 *  B       (input) DOUBLE PRECISION array, dimension (LDB,N)
 *          The upper quasi-triangular matrix B, in Schur canonical form.
 *
 *  LDB     (input) INTEGER
 *          The leading dimension of the array B. LDB >= max(1,N).
 *
 *  C       (input/output) DOUBLE PRECISION array, dimension (LDC,N)
 *          On entry, the M-by-N right hand side matrix C.
 *          On exit, C is overwritten by the solution matrix X.
 *
 *  LDC     (input) INTEGER
 *          The leading dimension of the array C. LDC >= max(1,M)
 *
 *  SCALE   (output) DOUBLE PRECISION
 *          The scale factor, scale, set <= 1 to avoid overflow in X.
 *
 *  INFO    (output) INTEGER
 *          = 0: successful exit
 *          < 0: if INFO = -i, the i-th argument had an illegal value
 *          = 1: A and B have common or very close eigenvalues; perturbed
 *               values were used to solve the equation (but the matrices
 *               A and B are unchanged).
 *
 *  =====================================================================
 *
 *     .. Parameters ..

Constructor Summary

Dtrsyl()

Method Summary

static void

dtrsyl(java.lang.String trana, java.lang.String tranb, int isgn, int m, int n, double[] a, int _a_offset, int lda, double[] b, int _b_offset, int ldb, double[] c, int _c_offset, int Ldc, doubleW scale, intW info)

Methods inherited from class java.lang.Object

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

Constructor Detail

Dtrsyl

public Dtrsyl()

Method Detail

dtrsyl

public static void dtrsyl(java.lang.String trana,
                          java.lang.String tranb,
                          int isgn,
                          int m,
                          int n,
                          double[] a,
                          int _a_offset,
                          int lda,
                          double[] b,
                          int _b_offset,
                          int ldb,
                          double[] c,
                          int _c_offset,
                          int Ldc,
                          doubleW scale,
                          intW info)