atan2d(3M)atan2d(3M)NAMEatan2d(), atan2df(), atan2dl(), atan2dw(), atan2dq() - degree-valued
arctangent-and-quadrant functions
SYNOPSIS
HP Integrity Server Only
DESCRIPTION
is a degree-valued version of the function. It returns the arctangent
of y/x, in the range −180 to 180, using the signs of both arguments to
determine the quadrant of the return value.
is a version of it takes arguments and returns a result.
Integrity Server Only
is a version of it takes arguments and returns a result.
is an version of it takes arguments and returns an result.
is equivalent to on HP-UX systems.
USAGE
To use these functions compile either with the default option or with
the and the options.
To use (for Integrity servers) or compile also with the option.
To use any of these functions, make sure your program includes and link
in the math library by specifying on the compiler or linker command
line.
For more information, see the at the following site:
RETURN VALUE
If y and x is −0,
If y and x is +0,
If y and x is less than zero,
If y and x is greater than zero, returns
If y is less than zero and x is zero, returns −90.
If y is greater than zero and x is zero, returns 90.
If y is greater than zero and x is −INFINITY, returns 180.
If y is less than zero and x is −INFINITY, returns −180.
If y is greater than zero and x is INFINITY, returns +0.
If y is less than zero and x is INFINITY, returns −0.
If y and x is finite, returns
If y and x is −INFINITY, returns
If y and x is +INFINITY, returns
If x or y is NaN, returns NaN.
ERRORS
No errors are defined.
SEE ALSOacosd(3M), asind(3M), atand(3M), atan2(3M), cosd(3M), sind(3M),
tand(3M), math(5).
STANDARDS CONFORMANCE
These functions are not specified by any standard.
atan2d(3M)
