R devel - Mar 2005 - Trigonometric functions (PR#7728)

Full_Name: Stijn Ruiter
Version: 2.0.1
OS: Linux
Submission from: (NULL) (195.169.225.10)


Why does

asin(1)
result in:
1.570796

and

x<-sqrt(2)
asin(x^2-1)
result in:
NaN

On Wed, 16 Mar 2005 s.ruiter@ru.nl wrote:
>
> Why does
>
> asin(1)
> result in:
> 1.570796
Because the arcsin of 1 is pi/2 radians.
> and
>
> x<-sqrt(2)
> asin(x^2-1)
> result in:
> NaN
Because you can't take the arcsin of 2^2-1=3.

 	-thomas