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
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