Asin

Return the inverse sine (arcsin) of a number. The inverse sine of x is the angle in radians whose sine is equal to x.

Syntax

Asin(x)

Arguments

• x

  Must be a real number between -1.0 and 1.0, inclusive

Returns

The inverse sine of x, in radians

Exceptions

If x is not a number, or is less than -1.0 or greater than 1.0, an error value is returned

Example

• Asin(-0.5)

  [Returns -0.5236]

• Asin(TagVal('att1','y+8h'))

  [Return the inverse sine of the value of 'att1' at 8am yesterday]

• Asin('att1')

  [Return the inverse sine of the value of 'att1' at trigger time]