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slags2 (3)
  • >> slags2 (3) ( Solaris man: Библиотечные вызовы )
  • 
    NAME
         slags2 - compute 2-by-2 orthogonal matrices U, V and Q, such
         that  if  ( UPPER ) then   U'*A*Q = U'*( A1 A2 )*Q = ( x 0 )
         ( 0 A3 ) ( x x ) and  V'*B*Q = V'*( B1 B2 )*Q = ( x 0 )  ( 0
         B3 ) ( x x )  or if ( .NOT.UPPER ) then   U'*A*Q = U'*( A1 0
         )*Q = ( x x )  ( A2 A3 ) ( 0 x ) and  V'*B*Q = V'*( B1 0 )*Q
         =  ( x x )  ( B2 B3 ) ( 0 x )  The rows of the transformed A
         and B are parallel, where   U = ( CSU SNU ), V = (  CSV  SNV
         ),  Q = ( CSQ SNQ )  (-SNU CSU ) (-SNV CSV ) (-SNQ CSQ )  Z'
         denotes the transpose of Z
    
    SYNOPSIS
         SUBROUTINE SLAGS2( UPPER, A1, A2, A3, B1, B2, B3, CSU,  SNU,
                   CSV, SNV, CSQ, SNQ )
    
         LOGICAL UPPER
    
         REAL A1, A2, A3, B1, B2, B3, CSQ, CSU, CSV, SNQ, SNU, SNV
    
    
    
         #include <sunperf.h>
    
         void slags2(int upper, float a1, float a2, float  a3,  float
                   b1,  float  b2,  float b3, float *csu, float *snu,
                   float *csv, float *snv, float *csq, float *snq);
    
    PURPOSE
         SLAGS2 computes 2-by-2 orthogonal matrices U, V and Q,  such
         that if ( UPPER ) then
    
    
    ARGUMENTS
         UPPER     (input) LOGICAL
                   = .TRUE.: the input matrices A  and  B  are  upper
                   triangular.
                   = .FALSE.: the input matrices A and  B  are  lower
                   triangular.
    
         A1        (input) REAL
                   A2       (input)  REAL  A3       (input)  REAL  On
                   entry,  A1, A2 and A3 are elements of the input 2-
                   by-2 upper (lower) triangular matrix A.
    
         B1        (input) REAL
                   B2       (input)  REAL  B3       (input)  REAL  On
                   entry,  B1, B2 and B3 are elements of the input 2-
                   by-2 upper (lower) triangular matrix B.
    
         CSU       (output) REAL
                   SNU      (output)  REAL  The  desired   orthogonal
                   matrix U.
    
         CSV       (output) REAL
                   SNV      (output)  REAL  The  desired   orthogonal
                   matrix V.
    
         CSQ       (output) REAL
                   SNQ      (output)  REAL  The  desired   orthogonal
                   matrix Q.
    
    
    
    


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