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dlasy2 examples
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Man Page Details
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NAME
       DLASY2  -  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).

       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  per-
               turbed  to  get a nonsingular equation.  NOTE: In the interests
               of speed, this routine does not check the inputs for errors.

