DLASY2 man page on IRIX

Man page or keyword search:  
man Server   31559 pages
apropos Keyword Search (all sections)
Output format
IRIX logo
[printable version]



DLASY2(3F)							    DLASY2(3F)

NAME
     DLASY2 - solve for the N1 by N2 matrix X, 1 <= N1,N2 <= 2, in   op(TL)*X
     + ISGN*X*op(TR) = SCALE*B,

SYNOPSIS
     SUBROUTINE DLASY2( LTRANL, LTRANR, ISGN, N1, N2, TL, LDTL, TR, LDTR, B,
			LDB, SCALE, X, LDX, XNORM, INFO )

	 LOGICAL	LTRANL, LTRANR

	 INTEGER	INFO, ISGN, LDB, LDTL, LDTR, LDX, N1, N2

	 DOUBLE		PRECISION SCALE, XNORM

	 DOUBLE		PRECISION B( LDB, * ), TL( LDTL, * ), TR( LDTR, * ),
			X( LDX, * )

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

     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', where T' denotes the transpose of T.

ARGUMENTS
     LTRANL  (input) LOGICAL
	     On entry, LTRANL specifies the op(TL):  = .FALSE., op(TL) = TL, =
	     .TRUE., op(TL) = TL'.

     LTRANR  (input) LOGICAL
	     On entry, LTRANR specifies the op(TR):  = .FALSE., op(TR) = TR, =
	     .TRUE., op(TR) = TR'.

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

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

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

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

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

									Page 1

DLASY2(3F)							    DLASY2(3F)

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

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

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

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

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

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

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

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

     INFO    (output) 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.

									Page 2

[top]

List of man pages available for IRIX

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