Math trigonometric functions
- math.acos()
- math.acosh()
- math.asin()
- math.asinh()
- math.atan()
- math.atan2()
- math.atanh()
- math.cos()
- math.cosh()
- math.sin()
- math.sinh()
- math.sqrt()
- math.tan()
- math.tanh()
math.atan()
Computes the principal value of the arc tangent of its argument x.
Parameters
x - Floating point value.
Return Value
Upon successful completion, this function returns the arc tangent of x in the
range -math.PI_2 to math.PI_2 radians inclusive.
If x is math.NAN, a NaN will be returned.
If x is ±0, x will be returned.
If x is math.POS_INFINITY or math.NEG_INFINITY, ±math.PI_2 will be returned.
If x is subnormal, a range error occurs and x will be returned.
Errors
If the x argument is subnormal, then fastly.error will be set to ERANGE.
Format
FLOAT
math.atan(FLOAT x)
Examples
1
2
3
declare local var.fo FLOAT;
set var.fo = math.atan(1);