Documentation fix regarding atan2

In Table 9.4 of the documentation atan2 is described as follows:
atan2(*x*, *y*) inverse tangent of *x*/*y*

I am sure it should read as:
atan2(*y*, x) inverse tangent of y/x

This looks to be the standard C++/c atan2(y,x) function.

You can easily test this:
If y = 2, x = 1, then degrees(atan(y/x)) =63.4 but if we proceed according
to the documentation; degrees(atan2(x,y))=degrees(atan2(1,2))=25.6 which is
not the same as degrees(atan(y/x)).
So it must be degrees(atan2(y,x))=degrees(atan2(2,1))=63.4.

Thanks
Andrew

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Andrew J. P. Maclean
Centre for Autonomous Systems
The Rose Street Building J04
The University of Sydney 2006 NSW
AUSTRALIA
Ph: +61 2 9351 3283
Fax: +61 2 9351 7474
URL: http://www.acfr.usyd.edu.au/
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