ztrsyl(l) [redhat man page]

ZTRSYL(l)								 )								 ZTRSYL(l)

NAME

       ZTRSYL - solve the complex Sylvester matrix equation

SYNOPSIS

       SUBROUTINE ZTRSYL( TRANA, TRANB, ISGN, M, N, A, LDA, B, LDB, C, LDC, SCALE, INFO )

	   CHARACTER	  TRANA, TRANB

	   INTEGER	  INFO, ISGN, LDA, LDB, LDC, M, N

	   DOUBLE	  PRECISION SCALE

	   COMPLEX*16	  A( LDA, * ), B( LDB, * ), C( LDC, * )

PURPOSE

       ZTRSYL solves the complex 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**H, and A and B are both upper 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.

ARGUMENTS

       TRANA   (input) CHARACTER*1
	       Specifies the option op(A):
	       = 'N': op(A) = A    (No transpose)
	       = 'C': op(A) = A**H (Conjugate transpose)

       TRANB   (input) CHARACTER*1
	       Specifies the option op(B):
	       = 'N': op(B) = B    (No transpose)
	       = 'C': op(B) = B**H (Conjugate 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) COMPLEX*16 array, dimension (LDA,M)
	       The upper triangular matrix A.

       LDA     (input) INTEGER
	       The leading dimension of the array A. LDA >= max(1,M).

       B       (input) COMPLEX*16 array, dimension (LDB,N)
	       The upper triangular matrix B.

       LDB     (input) INTEGER
	       The leading dimension of the array B. LDB >= max(1,N).

       C       (input/output) COMPLEX*16 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).

LAPACK version 3.0						   15 June 2000 							 ZTRSYL(l)

ztrsyl.f(3)							      LAPACK							       ztrsyl.f(3)

NAME

       ztrsyl.f -

SYNOPSIS

   Functions/Subroutines
       subroutine ztrsyl (TRANA, TRANB, ISGN, M, N, A, LDA, B, LDB, C, LDC, SCALE, INFO)
	   ZTRSYL

Function/Subroutine Documentation
   subroutine ztrsyl (characterTRANA, characterTRANB, integerISGN, integerM, integerN, complex*16, dimension( lda, * )A, integerLDA, complex*16,
       dimension( ldb, * )B, integerLDB, complex*16, dimension( ldc, * )C, integerLDC, double precisionSCALE, integerINFO)
       ZTRSYL

       Purpose:

	    ZTRSYL solves the complex 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**H, and A and B are both upper 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.

       Parameters:
	   TRANA

		     TRANA is CHARACTER*1
		     Specifies the option op(A):
		     = 'N': op(A) = A	 (No transpose)
		     = 'C': op(A) = A**H (Conjugate transpose)

	   TRANB

		     TRANB is CHARACTER*1
		     Specifies the option op(B):
		     = 'N': op(B) = B	 (No transpose)
		     = 'C': op(B) = B**H (Conjugate transpose)

	   ISGN

		     ISGN is 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

		     M is INTEGER
		     The order of the matrix A, and the number of rows in the
		     matrices X and C. M >= 0.

	   N

		     N is INTEGER
		     The order of the matrix B, and the number of columns in the
		     matrices X and C. N >= 0.

	   A

		     A is COMPLEX*16 array, dimension (LDA,M)
		     The upper triangular matrix A.

	   LDA

		     LDA is INTEGER
		     The leading dimension of the array A. LDA >= max(1,M).

	   B

		     B is COMPLEX*16 array, dimension (LDB,N)
		     The upper triangular matrix B.

	   LDB

		     LDB is INTEGER
		     The leading dimension of the array B. LDB >= max(1,N).

	   C

		     C is COMPLEX*16 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

		     LDC is INTEGER
		     The leading dimension of the array C. LDC >= max(1,M)

	   SCALE

		     SCALE is DOUBLE PRECISION
		     The scale factor, scale, set <= 1 to avoid overflow in X.

	   INFO

		     INFO is 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).

       Author:
	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

       Date:
	   November 2011

       Definition at line 157 of file ztrsyl.f.

Author
       Generated automatically by Doxygen for LAPACK from the source code.

Version 3.4.1							  Sun May 26 2013						       ztrsyl.f(3)