- 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.asin()
Computes the principal value of the arc sine of the argument x.
Parameters
x - Floating point value. The value of x should be in the range -1 to 1 inclusive.
Return value
Upon successful completion, this function returns the arc sine 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
, a domain error occurs and a NaN will be returned.
If x is subnormal, a range error occurs and x will be returned.
For finite values of x not in the range -1 to 1 inclusive, a domain error occurs and a NaN will be returned.
Errors
- If the x argument is finite and is not in the range -1 to 1 inclusive, or is
math.POS_INFINITY
ormath.NEG_INFINITY
, thenfastly.error
will be set toEDOM
. - If the x argument is subnormal, then
fastly.error
will be set toERANGE
.
Format
FLOAT
math.asin(FLOAT x)
Examples
1
2
3
declare local var.fo FLOAT;
set var.fo = math.asin(1.0);