From rb@er @ending from @t@u@edu  Mon Jul 16 20:47:57 2018
From: rb@er @ending from @t@u@edu (Robert Baer)
Date: Mon, 16 Jul 2018 13:47:57 -0500
Subject: [Rd] persp command
In-Reply-To: <CADX8qG3jK8rmPPpAjZ2NFOdhahEzGE=Mq0q=kGJbaiTHBbj4Dw@mail.gmail.com>
References: <CADX8qG3jK8rmPPpAjZ2NFOdhahEzGE=Mq0q=kGJbaiTHBbj4Dw@mail.gmail.com>
Message-ID: <b75ae71f-3909-c151-01c4-260fc2d08687@atsu.edu>


On 7/16/2018 7:28 AM, Christian Rau wrote:
> Dear R-devel mailing list,
>
> I am wondering whether the "theta" and "phi" parameters of the "persp"
> function
> in the graphics commands are named in error (the names seem to have been
> swapped).
Not that it is authoritative, but one gleans from wikipedia, 
https://en.wikipedia.org/wiki/Spherical_coordinate_system ,? that 
phyicists and mathematicians have exactly opposite conventions for the 
meaning of theta and phi .

In the end, a symbol is just a standin for what it "stands for" so, we 
just need to follow the persp convention when using persp. :-)

> Also, in the documentation to "persp", reference is made to
> "colatitude"
> when the effect in the image is actually that of "latitude".
>
> Thank you,
> Sincerely,
> Christian
>
> 	[[alternative HTML version deleted]]
>
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel

-- 


--
Robert W. Baer, Ph.D.
Professor of Physiology
Kirksville College of Osteopathic Medicine
A T Still University of Health Sciences
800 W. Jefferson St
Kirksville, MO 63501
660-626-2321 Department
660-626-2965 FAX



[Rd] persp command
Robert Baer