CentOS 7.0 - man page for dlasy2 (centos section 3)

Linux & Unix Commands - Search Man Pages

Man Page or Keyword Search:   man
Select Man Page Set:       apropos Keyword Search (sections above)


dlasy2.f(3)				      LAPACK				      dlasy2.f(3)

NAME
       dlasy2.f -

SYNOPSIS
   Functions/Subroutines
       subroutine dlasy2 (LTRANL, LTRANR, ISGN, N1, N2, TL, LDTL, TR, LDTR, B, LDB, SCALE, X,
	   LDX, XNORM, INFO)
	   DLASY2 solves the Sylvester matrix equation where the matrices are of order 1 or 2.

Function/Subroutine Documentation
   subroutine dlasy2 (logicalLTRANL, logicalLTRANR, integerISGN, integerN1, integerN2, double
       precision, dimension( ldtl, * )TL, integerLDTL, double precision, dimension( ldtr, * )TR,
       integerLDTR, double precision, dimension( ldb, * )B, integerLDB, double precisionSCALE,
       double precision, dimension( ldx, * )X, integerLDX, double precisionXNORM, integerINFO)
       DLASY2 solves the Sylvester matrix equation where the matrices are of order 1 or 2.

       Purpose:

	    DLASY2 solves for the N1 by N2 matrix X, 1 <= N1,N2 <= 2, in

		   op(TL)*X + ISGN*X*op(TR) = SCALE*B,

	    where TL is N1 by N1, TR is N2 by N2, B is N1 by N2, and ISGN = 1 or
	    -1.  op(T) = T or T**T, where T**T denotes the transpose of T.

       Parameters:
	   LTRANL

		     LTRANL is LOGICAL
		     On entry, LTRANL specifies the op(TL):
			= .FALSE., op(TL) = TL,
			= .TRUE., op(TL) = TL**T.

	   LTRANR

		     LTRANR is LOGICAL
		     On entry, LTRANR specifies the op(TR):
		       = .FALSE., op(TR) = TR,
		       = .TRUE., op(TR) = TR**T.

	   ISGN

		     ISGN is INTEGER
		     On entry, ISGN specifies the sign of the equation
		     as described before. ISGN may only be 1 or -1.

	   N1

		     N1 is INTEGER
		     On entry, N1 specifies the order of matrix TL.
		     N1 may only be 0, 1 or 2.

	   N2

		     N2 is INTEGER
		     On entry, N2 specifies the order of matrix TR.
		     N2 may only be 0, 1 or 2.

	   TL

		     TL is DOUBLE PRECISION array, dimension (LDTL,2)
		     On entry, TL contains an N1 by N1 matrix.

	   LDTL

		     LDTL is INTEGER
		     The leading dimension of the matrix TL. LDTL >= max(1,N1).

	   TR

		     TR is DOUBLE PRECISION array, dimension (LDTR,2)
		     On entry, TR contains an N2 by N2 matrix.

	   LDTR

		     LDTR is INTEGER
		     The leading dimension of the matrix TR. LDTR >= max(1,N2).

	   B

		     B is DOUBLE PRECISION array, dimension (LDB,2)
		     On entry, the N1 by N2 matrix B contains the right-hand
		     side of the equation.

	   LDB

		     LDB is INTEGER
		     The leading dimension of the matrix B. LDB >= max(1,N1).

	   SCALE

		     SCALE is DOUBLE PRECISION
		     On exit, SCALE contains the scale factor. SCALE is chosen
		     less than or equal to 1 to prevent the solution overflowing.

	   X

		     X is DOUBLE PRECISION array, dimension (LDX,2)
		     On exit, X contains the N1 by N2 solution.

	   LDX

		     LDX is INTEGER
		     The leading dimension of the matrix X. LDX >= max(1,N1).

	   XNORM

		     XNORM is DOUBLE PRECISION
		     On exit, XNORM is the infinity-norm of the solution.

	   INFO

		     INFO is INTEGER
		     On exit, INFO is set to
			0: successful exit.
			1: TL and TR have too close eigenvalues, so TL or
			   TR is perturbed to get a nonsingular equation.
		     NOTE: In the interests of speed, this routine does not
			   check the inputs for errors.

       Author:
	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

       Date:
	   September 2012

       Definition at line 174 of file dlasy2.f.

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

Version 3.4.2				 Tue Sep 25 2012			      dlasy2.f(3)
Unix & Linux Commands & Man Pages : ©2000 - 2018 Unix and Linux Forums


All times are GMT -4. The time now is 02:38 PM.

Unix & Linux Forums Content Copyright©1993-2018. All Rights Reserved.
×
UNIX.COM Login
Username:
Password:  
Show Password





Not a Forum Member?
Forgot Password?