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atan2 (3)
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    NAME

    atan2, atan2f, atan2l - arc tangent function
     
    

    SYNOPSIS

    c99 [ flag... ] file... -lm [ library... ]
    #include <math.h>
    
    double atan2(double y, double x);
    

    float atan2f(float y, float x);
    

    long double atan2l(long double y, long double x);
    

     

    DESCRIPTION

    These functions compute the principal value of the arc tangent of y/x, using the signs of both arguments to determine the quadrant of the return value.  

    RETURN VALUES

    Upon successful completion, these functions return the arc tangent of y/x in the range [ -pi ,pi
     ] radians.

    If y is ±0 and x is < 0, ±pi
     is returned.

    If y is ±0 and x is > 0, ±0 is returned.

    If y is < 0 and x is ±0, -pi /2 is returned.

    If y is > 0 and x is ±0, pi /2 is returned.

    If x is 0, a pole error does not occur.

    If either x or y is NaN, a NaN is returned.

    If y is ±0 and x is -0, ±pi
     is returned.

    If y is ±0 and x is +0, ±0 is returned.

    For finite values of ±y > 0, if x is -Inf, ±pi
     is returned.

    For finite values of ±y > 0, if x is +Inf, ±0 is returned.

    For finite values of x, if y is ±Inf, ±pi /2 is returned.

    If y is ±Inf and x is -Inf, ±3pi /4 is returned.

    If y is ±Inf and x is +Inf, ±pi /4 is returned.

    If both arguments are 0, a domain error does not occur.  

    ERRORS

    No errors are defined.  

    ATTRIBUTES

    See attributes(5) for descriptions of the following attributes:

    ATTRIBUTE TYPEATTRIBUTE VALUE

    Interface StabilityStandard

    MT-Level

     

    SEE ALSO

    atan(3M), isnan(3M), math.h(3HEAD)tan(3M), attributes(5), standards(5)


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUES
    ERRORS
    ATTRIBUTES
    SEE ALSO


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