Hi William et al,
I am running sage-2.8.13-i686-Linux-Ubuntu.tar.gz, reading
the tutorial.
Meta comment: How about using hevea instead of latex2html?
(Licensing issue)
0 [EMAIL PROTECTED]:~$apt-cache policy hevea latex2html|grep feisty
500 http://proxy.aims.ac.za feisty/main Packages
500 http://proxy.aims.ac.za feisty/multiverse Packages
<snip https://localhost:8000/doc/live/tut/about.html>
Comments and Questions
On to the good stuff:
General comments and questions regarding this document should be sent by
email to [EMAIL PROTECTED] If you are able to provide suggested text,
either to replace existing incorrect or unclear material, or additional
text to supplement what's already available, we'd appreciate the
contribution.
</snip>
^^ Fix that notice to point to sage-support
In the tutorial, all main page titles at the top seem to
be lower case only. e.g.
2.10.2 systems of des using laplace transforms
Should read Systems of DEs...
(Firefox on Feisty)
2.10.2, few lines on: equatoins should read equations
3.9 saving and loading complete sessions
Some of the yellow blocks of unix shell code around section 3,
which should be <pre> is displaying with italics and font errors.
In secion 3.9 for instance, the first yellow code block, only
~/tmp is in verbatim font, then follows italic, larger, sagesage: ...
When I view page source I get (should that not all be class="verbatim"?):
<div class="verbatim"><pre>~/tmp<span class="math"> sage sage: E =
EllipticCurve('11a') sage: M = ModularSymbols(37) sage: a = 389 sage: t
= M.T(2003).matrix(); t.charpoly().factor() _4 = (x - 2004) * (x -
12)^2 * (x + 54)^2 </pre>...
3.10 the notebook interface:
"displaces the SAGE notebook webpage."
should read
"displays the SAGE notebook webpage."
4.2 GAP
SAGE comes with GAP 4.4.7 for computational discrete mathematics,
especially group theory.
Should read "4.4.10" by now.
4.2 GAP (occurs elswhere too) The last line, <code><span
class="math">SAGE_ROOT/local/lib/gap-4.4.7/pkg</code>.
the _R is rendered as a subscript. The text is large and italic.
Should be verbatim.
4.4 maxima
The yellow code blocks show "sage.:" as the sage prompt,
not "sage:".
5.1 loading and attaching sage files
In particular, attach has the side effect of (auto-reload), very handy
when debugging code, while load does not.
^^ What are the parentheses for?
6.1.2 how some python annoyances are resolved in sage
Integer division: The expression 2/3 has much different behavior in
Python than in any standard math system. In Python, if m and n are
ints then m/n is also an int, namely the quotient of m divided by n .
Therefore 2/3=0 . This illustrates how Python is similar to C in many
ways (arrays are also indexed starting at 0). There has been talk in the
Python community about changing Python so 2/3 returns the floating point
number 0.6666..., and making 2//3 return 0 .
^^^^^^^^^ my comment:
"from __future__ import" division will import the future behaviour,
apparantly as of python3.0, which is / real division and // integer
division.
6.3 how do i reference sage?
If you write a paper using SAGE, please reference computations done with
SAGE by including
[SAGE], SAGE Mathematical Software, Version 2.6, http://www.sagemath.org
^^^
How about a function bibtex() similar to latex() which gives a bibtex
entry? Coudl default to bibtex(sage) but could also provide
bibtex(pari), bibtex(gp), bibtex(Singular), etc.
If you happen to have just read straight through this tutorial, and have
some sense of how long it took you, please let me know (email
[EMAIL PROTECTED]).
^^^ Uhm, I did an hour or two yesterday and an hour or two today.
Not sure. It's much more of a showcase() than a tutorial(). It has a
heavy algebraic slant, and most students start learning more numerical
work. ODE and Statistics examples would be great (I know, I know, submit
them, I'm trying to learn SAGE!). We teach almost exclusively scipy
at www.aims.ac.za now, but some lecturers still teach Maxima, Octave,
and R, even Singular and GAP, and I would like to see them unified via SAGE,
probably.
Separate issue:
I have permission problems installing sage system wide in a lab.
I want each student to run their own sage and notebook(). (We don't
have a central powerful machine to run a notebook for everyone to connect
to...) Aftera untarring sage in /usr/local/src, chmod -R +r,
chown -R root.root, etc. I run sage once (as root) and run notebook()
as myself. Then other arb users don't have access to run notebook.
Should I be setting a password I have to give everyone? I'd like to allow
each of them to set their own notebook() password, in ~/.sage, instead of
using /usr/local/src/sageVERSION/sage_notebook/ (if that makes sense?):
[EMAIL PROTECTED]:~$sage
----------------------------------------------------------------------
| SAGE Version 2.8.13, Release Date: 2007-11-21 |
| Type notebook() for the GUI, and license() for information. |
----------------------------------------------------------------------
sage: notebook()
---------------------------------------------------------------------------
<type 'exceptions.OSError'> Traceback (most recent call last)
/usr/local/src/sage-2.8.13-i686-Linux/<ipython console> in <module>()
/usr/local/src/sage-2.8.13-i686-Linux/local/lib/python2.5/site-packages/sage/server/notebook/notebook_object.py
in __call__(self, *args, **kwds)
135 """
136 def __call__(self, *args, **kwds):
--> 137 return self.notebook(*args, **kwds)
138
139 notebook = run_notebook.notebook_twisted
/usr/local/src/sage-2.8.13-i686-Linux/local/lib/python2.5/site-packages/sage/server/notebook/run_notebook.py
in notebook_twisted(self, directory, port, address, port_tries, secure, reset,
accounts, server_pool, ulimit, timeout, open_viewer, sagetex_path, start_path)
61 start_path = ""):
62 if not os.path.exists(directory):
---> 63 os.makedirs(directory)
64 port = int(port)
65 conf = '%s/twistedconf.tac'%directory
/usr/local/src/sage-2.8.13-i686-Linux/local/lib/python/os.py in makedirs(name,
mode)
170 if tail == curdir: # xxx/newdir/. exists if
xxx/newdir exists
171 return
--> 172 mkdir(name, mode)
173
174 def removedirs(name):
<type 'exceptions.OSError'>: [Errno 13] Permission denied: 'sage_notebook'
Also, it would be great to have a few lines documented to install system
wide on identically imaged machines (with central auth/filespace),
something like:
sudo -i
cd /usr/local/src/
wget
http://www.sagemath.org/SAGEbin/linux/32bit/sage-2.8.13-i686-Linux-Ubuntu.tar.gz
tar xvzf sage-2.8.13-i686-Linux-Ubuntu.tar.gz
cp sage-2.8.13-i686-Linux/sage /usr/local/bin/
sed -ie 's#="....."#="/usr/local/src/sage-2.8.13-i686-Linux/"#'
/usr/local/bin/sage
rm /usr/local/bin/sagee
chmod a+r -R /usr/local/src/sage-2.8.13-i686-Linux
chown -R root.root sage-2.8.13-i686-Linux
echo "exit" | sage # (run once as root and exit)
# set up notebook to allow all users to run their own notebook
# from their own .sage?
Oh, and thanks for the awesome work for Free Software and Science!
regards,
Jan
--
.~.
/V\ Jan Groenewald
/( )\ www.aims.ac.za
^^-^^
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