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math (3)
  • >> math (3) ( FreeBSD man: Библиотечные вызовы )
  • Ключ math обнаружен в базе ключевых слов.

  • BSD mandoc


     - floating-point mathematical library


    Lb libm


       #include <math.h>


    These functions constitute the C math library.  


    Each of the following Vt double functions has a Vt float counterpart with an `f' appended to the name and a Vt long double counterpart with an `l' appended. As an example, the Vt float and Vt long double counterparts of double acos (double x);
    are float acosf (float x);
    and long double acosl (long double x ,);

    Algebraic Functions

    Name  Description cbrt     cube root
    fma     fused multiply-add
    hypot   Euclidean distance
    sqrt    square root


    Classification Functions

    Name  Description fpclassify       classify a floating-point value
    isfinite        determine whether a value is finite
    isinf   determine whether a value is infinite
    isnan   determine whether a value is
    isnormal        determine whether a value is normalized


    Exponent Manipulation Functions

    Name  Description frexp    extract exponent and mantissa
    ilogb   extract exponent
    ldexp   multiply by power of 2
    logb    extract exponent
    scalbln adjust exponent
    scalbn  adjust exponent


    Extremum- and Sign-Related Functions

    Name  Description copysign copy sign bit
    fabs    absolute value
    fdim    positive difference
    fmax    maximum function
    fmin    minimum function
    signbit extract sign bit


    Residue and Rounding Functions

    Name  Description ceil     integer no less than
    floor   integer no greater than
    fmod    positive remainder
    llrint  round to integer in fixed-point format
    llround round to nearest integer in fixed-point format
    lrint   round to integer in fixed-point format
    lround  round to nearest integer in fixed-point format
    modf    extract integer and fractional parts
    nearbyint       round to integer (silent)
    nextafter       next representable value
    nexttoward      next representable value
    remainder       remainder
    remquo  remainder with partial quotient
    rint    round to integer
    round   round to nearest integer
    trunc   integer no greater in magnitude than

    The ceil (,);
    floor (,);
    llround (,);
    lround (,);
    round (,);
    and trunc ();
    functions round in predetermined directions, whereas llrint (,);
    lrint (,);
    and rint ();
    round according to the current (dynamic) rounding mode. For more information on controlling the dynamic rounding mode, see fenv(3) and fesetround(3).  

    Silent Order Predicates

    Name  Description isgreater        greater than relation
    isgreaterequal  greater than or equal to relation
    isless  less than relation
    islessequal     less than or equal to relation
    islessgreater   less than or greater than relation
    isunordered     unordered relation


    Transcendental Functions

    Name  Description acos     inverse cosine
    acosh   inverse hyperbolic cosine
    asin    inverse sine
    asinh   inverse hyperbolic sine
    atan    inverse tangent
    atanh   inverse hyperbolic tangent
    atan2   atan(y/x); complex argument
    cos     cosine
    cosh    hyperbolic cosine
    erf     error function
    erfc    complementary error function
    exp     exponential base e
    exp2    exponential base 2
    expm1   exp(x)-1
    j0      Bessel function of the first kind of the order 0
    j1      Bessel function of the first kind of the order 1
    jn      Bessel function of the first kind of the order n
    lgamma  log gamma function
    log     natural logarithm
    log10   logarithm to base 10
    log1p   log(1+x)
    pow    exponential x**y
    sin     trigonometric function
    sinh    hyperbolic function
    tan     trigonometric function
    tanh    hyperbolic function
    tgamma  gamma function
    y0      Bessel function of the second kind of the order 0
    y1      Bessel function of the second kind of the order 1
    yn      Bessel function of the second kind of the order n

    Unlike the algebraic functions listed earlier, the routines in this section may not produce a result that is correctly rounded, so reproducible results cannot be guaranteed across platforms. For most of these functions, however, incorrect rounding occurs rarely, and then only in very-close-to-halfway cases.  


    fenv(3), ieee(3)  


    A math library with many of the present functions appeared in AT&T System v7 . The library was substantially rewritten for BSD 4.3 to provide better accuracy and speed on machines supporting either VAX or IEEE 754 floating-point. Most of this library was replaced with FDLIBM, developed at Sun Microsystems, in Fx 1.1.5 . Additional routines, including ones for Vt float and Vt long double values, were written for or imported into subsequent versions of FreeBSD.  


    The log2 ();
    and nan ();
    functions are missing, and many functions are not available in their Vt long double variants.

    Many of the routines to compute transcendental functions produce inaccurate results in other than the default rounding mode.

    On some architectures, trigonometric argument reduction is not performed accurately, resulting in errors greater than 1 ulp for large arguments to cos (,);
    sin (,);
    and tan (.);



    Algebraic Functions
    Classification Functions
    Exponent Manipulation Functions
    Extremum- and Sign-Related Functions
    Residue and Rounding Functions
    Silent Order Predicates
    Transcendental Functions

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