- 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);