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slartg (3)
  • >> slartg (3) ( Solaris man: Библиотечные вызовы )
  • 
    NAME
         slartg - generate a plane rotation so that   [ CS SN ]
    
    SYNOPSIS
         SUBROUTINE SLARTG( F, G, CS, SN, R )
    
         REAL CS, F, G, R, SN
    
    
    
         #include <sunperf.h>
    
         void slartg(float f, float g, float *cs,  float  *sn,  float
                   *r) ;
    
    PURPOSE
         SLARTG generate a plane rotation so that
            [ -SN  CS  ]     [ G ]     [ 0 ]
    
         This is a slower, more accurate version of the BLAS1 routine
         SROTG, with the following other differences:
            F and G are unchanged on return.
            If G=0, then CS=1 and SN=0.
            If F=0 and (G .ne. 0), then CS=0 and SN=1  without  doing
         any
               floating point operations (saves work in SBDSQR when
               there are zeros on the diagonal).
    
         If F exceeds G in magnitude, CS will be positive.
    
    
    ARGUMENTS
         F         (input) REAL
                   The first component of vector to be rotated.
    
         G         (input) REAL
                   The second component of vector to be rotated.
    
         CS        (output) REAL
                   The cosine of the rotation.
    
         SN        (output) REAL
                   The sine of the rotation.
    
         R         (output) REAL
                   The nonzero component of the rotated vector.
    
    
    
    


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