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cabs (3)
  • cabs (3) ( Solaris man: Библиотечные вызовы )
  • >> cabs (3) ( FreeBSD man: Библиотечные вызовы )
  • cabs (3) ( Русские man: Библиотечные вызовы )
  • cabs (3) ( Linux man: Библиотечные вызовы )
  • cabs (3) ( POSIX man: Библиотечные вызовы )

  • BSD mandoc
     

    NAME

    
    
    hypot
    
     
    hypotf
    
     
    cabs
    
     
    cabsf
    
     - Euclidean distance and complex absolute value functions
    
     
    

    LIBRARY

    Lb libm
    
     
    

    SYNOPSIS

       #include <math.h>
    double hypot (double x double y);
    float hypotf (float x float y);
       #include <complex.h>
    double cabs (double complex z);
    float cabsf (float complex z);
     

    DESCRIPTION

    The hypot ();
    and hypotf ();
    functions compute the sqrt(x*x+y*y) in such a way that underflow will not happen, and overflow occurs only if the final result deserves it. The cabs ();
    and cabsf ();
    functions compute the complex absolute value of Fa z .

    hypot ( v);
    = hypot (v );
    = + for all Fa v , including .  

    ERROR (due to Roundoff, etc.)

    Below 0.97 ulps Consequently hypot (5.0 12.0);
    = 13.0 exactly; in general, hypot and cabs return an integer whenever an integer might be expected.

    The same cannot be said for the shorter and faster version of hypot and cabs that is provided in the comments in cabs.c; its error can exceed 1.2 ulps  

    NOTES

    As might be expected, hypot (v );
    and hypot ( v);
    are for all finite Fa v . But programmers might be surprised at first to discover that hypot (± );
    = +. This is intentional; it happens because hypot ( v);
    = + for all Fa v , finite or infinite. Hence hypot ( v);
    is independent of Fa v . Unlike the reserved operand fault on a VAX the IEEE is designed to disappear when it turns out to be irrelevant, as it does in hypot ( .);
     

    SEE ALSO

    math(3), sqrt(3)  

    HISTORY

    Both a hypot ();
    function and a cabs ();
    function appeared in AT&T System v7 .


     

    Index

    NAME
    LIBRARY
    SYNOPSIS
    DESCRIPTION
    ERROR (due to Roundoff, etc.)
    NOTES
    SEE ALSO
    HISTORY


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