ASIN Function

Returns the arcsine of x.

enabled.

Usage

result = ASIN(x)

Input Parameters

x—The sine of the desired angle. Cannot be a complex data type and must be in the range of (– 1 ≤ x ≤ 1).

Returned Value

result—The arcsine of x.

Keywords

None.

Discussion

The inverse sine function, or arcsine, denoted by sin^–1, is defined by:

y = sin^{– 1}x

if and only if:

sin y = x

where:

–1 ≤  x ≤  1  and  –π / 2 ≤  y ≤ π /2

The parameter x can be an array, with the result having the same data type as x, where each element contains the arcsine of the corresponding element from x.

When x is of double-precision floating-point data type, the result is of the same type. All other data types are converted to single-precision floating-point and yield a floating-point result. The result is an angle, expressed in radians, whose sine is x.

Values generated by ASIN range between –π/2 and π/2.

Example

x = ASIN(0)
PRINT, x
; PV-WAVE prints: 0