Thanks a lot, John! (and sorry for the delay in answering)
I see the point: it is simply undefined.
But I do not quite agree with you in that [one] would not expect a
computer algebra system to give the same answers with simple
substitutions in the two orders: ideally, I would expect that the
Thanks for the answer, kcrisman!
My guess is that this is more of a convention than anything else.
[...]
sage: 0/x
0
If Mma and Maple do it too, that would be my guess. In any case, it is
'known' and I bet you'll find other examples with a search of the email
lists (though searching for
Hi there,
The wiki page is now a little improved, and I think it is publishable.
I don't know what to do with it now. Maybe indexing it under Tips and
Tricks or under Other Sage Items in the wiki?
Cheers,
Jesús Torrado
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Hi,
I finally got to work with Healpy again, and just for the record,
installing it in Sage is not a good idea any more, since it need quite
the latest versions of numpy, cython and pyfits.
Cheers,
Jesús
2012/9/25 Minh Nguyen mvngu.n...@gmail.com:
Hi,
On Tue, Sep 25, 2012 at 6:24 PM, Jesús
Hi there,
Sorry for the delay and thanks for the feedback!
I will definitely try to write a wiki page, now that I have a trac account
(vielen Dank, Harald!), at some point during the next few weeks.
Regarding the blog, I prefer the wiki: I most likely could not maintain it
right now.
Cheers,
Dear all,
I have managed to install healpy (Nasa's Healpix python wrapper) and make
it work in sage 5.1 (the current version in the AIMS ppa).
It is somehow trivial, but would it be interesting to publich somewhere the
instructions and a worksheet with the tutorial section in the
why we don't do it.
Glad to hear that my suggestion got liked.
Just in case it is useful, there go the overlay functions I wrote
for myself, which send every angle to the 1st quadrant, keeping track
of the signs:
# Thanks! Greetings,
# Jesús TC
def mycos(x) :
if x = 0 and x = pi/2
to the 1st quadrant: [0,pi/2].
Indeed, in Mathematica one gets
in: Cos[7/8*Pi]
out: -Cos[Pi/8]
Probably that should be implemented inside the trigonometric functions
code itself, instead of in any of the simplify's.
What do you think?
Jesús TC
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