ctrsyl man page on YellowDog

Man page or keyword search:  
man Server   18644 pages
apropos Keyword Search (all sections)
Output format
YellowDog logo
[printable version]

CTRSYL(l)			       )			     CTRSYL(l)

NAME
       CTRSYL - solve the complex Sylvester matrix equation

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

	   CHARACTER	  TRANA, TRANB

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

	   REAL		  SCALE

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

PURPOSE
       CTRSYL 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 matriā€
	       ces 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 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 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 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) REAL
	       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			     CTRSYL(l)
[top]

List of man pages available for YellowDog

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

[legal] [privacy] [GNU] [policy] [cookies] [netiquette] [sponsors] [FAQ]
Tweet
Polarhome, production since 1999.
Member of Polarhome portal.
Based on Fawad Halim's script.
....................................................................
Vote for polarhome
Free Shell Accounts :: the biggest list on the net