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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