[R] Calculate the angles for a point dataset?

[Rolf Turner]

On 14/09/2007, at 3:41 PM, zhijie zhang wrote:

> Dear Rusers,
>   I'd like to take the cases of cancer of the larynx in chorley 
> (spatstat) to
> explain my question.
>   I want to join the points of cancer of the larynx with the disused
> industrial incinerator to generate lines, and then calculate the  
> angles of
> these line comparing the horizontal line?
>   How can i get it? It seems to be difficult to get the angles
>   Thanks a lot.

?atan2

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