John Cremona writes:
> There is a lesson to be learned here, which is in fact very similar to
> one which William explained very well recently: beware the Sage
> preprocessor which converts every integer it sees to an Integer, which
> can have serious performance consequences and is often not ne
The patch here
http://trac.sagemath.org/sage_trac/ticket/8965
only changes documentation, doctests, comments and whitespace, so it
should be easy to review. I believe the file that is changed was
written by William.
Thanks,
Dan
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Most of this discussion is about cases where sage thinks it is acting on
a bigger set than the user wants it to. I'll just point out bug 8963
http://trac.sagemath.org/sage_trac/ticket/8963
where sage has the reverse problem: it thinks that the set that is
being acted on is smaller. For exam
Jens,
I now see that you've written an article on this topic and tested
exactly the case I've also tested: floating point 6j symbols in a
compiled language. Since your conclusions are different from mine, I'm
curious whether your storage system is faster or your 6j routine is
slower. Is your co
jyr writes:
> def test_calc_factlist(nn):
> r"""
> Function calculates a list of precomputed factorials in order to
> massively accelerate consequetive calculations of the various
Typo. And maybe say "future" instead of "consecutive"?
>
jyr writes:
> The thought has occured to me that one could use the index functions
> for the 3j, 6j, and Gaunt coefficients for a much simpler storage
> scheme in python by using the index as a key for a dictionary of
> stored symbols. I could then extend the above published routines with
> an o
John H Palmieri writes:
> class AlgebraIdeal(object):
> def __init__(self, A, gens = []):
> if not isinstance(A, Algebra): raise TypeError, "Argument A
> must be an algebra."
> self.__algebra = A
> self.__gens = gens
[...]
> sage: J = AlgebraIdeal(R, [y^2])
>
> Then
John H Palmieri <[EMAIL PROTECTED]> writes:
> I have several different vector space bases for an algebra A, and I
> have implemented this by having a class MyAlgebra, instances of which
> have an attribute _basis_name which is a string naming the basis. I
> have __cmp__ defined so that the basis
John H Palmieri <[EMAIL PROTECTED]> writes:
> What about tth? I've had pretty good luck with that, and when it
> works, it produces better-looking math than latex2html.
http://hutchinson.belmont.ma.us/tth/
tth has the advantage that it doesn't use images. I use tth to produce
the web versio
"William Stein" <[EMAIL PROTECTED]> writes:
> Sage Enhancement Proposal: Change comparisons that involve
> elements of the symbolic ring to return True or False if both sides
> of the symbolic comparison are constants and the comparison can
> be definitely determined.
I'm not sure what symbolic
Eric Drechsel <[EMAIL PROTECTED]> writes:
> We want to compute with octonions in Sage, and discussed at our
> meeting last night possibly implementing such an algebra.
>
> As I understand it, multiplication of octonions can be implemented on
> top of the quaternions in a simple way using the Cayl
Robert Bradshaw <[EMAIL PROTECTED]> writes:
> This is due to the inplace operator stuff using refcounts to
> determine if it's safe to mutate. The simple workaround is to not use
> numpy arrays of SAGE objects. Another question is why would one do so
> (i.e. what is lacking in the SAGE line
"William Stein" <[EMAIL PROTECTED]> writes:
> I've released sage-2.8.4.1, which is a very minor bugfix release:
Builds fine on Mac OS X 10.4.10, Intel Core 2 Duo:
real77m24.900s
user48m46.842s
sys 24m24.761s
...
SAGE build/upgrade complete!
All tests run by "make test" pass.
But "
"William Stein" <[EMAIL PROTECTED]> writes:
> On 8/21/07, Dan Christensen <[EMAIL PROTECTED]> wrote:
>
>> Hmm, a quick test using two tabs in one browser shows that even if
>> I save changes in one tab, if I reload the page in the other tab
>> the ch
My opinion would be to factor out the notebook interface as a completely
separate package that happens to be useful for sage, but is also useful
for lots of other software. So instead of a lite version of sage, and
a big version of sage which is a superset, the notebook would just be
a package th
"William Stein" <[EMAIL PROTECTED]> writes:
> On 8/20/07, Dan Christensen <[EMAIL PROTECTED]> wrote:
>
>> I'm also curious what happens if I leave a browser open to a worksheet
>> in my office, and then open the worksheet again from home. Do they
&
Nils Bruin <[EMAIL PROTECTED]> writes:
> This makes me think that a checkbox "this worksheet is persistent"
> might be better.
This sounds good to me.
I'm also curious what happens if I leave a browser open to a worksheet
in my office, and then open the worksheet again from home. Do they
someh
[EMAIL PROTECTED] writes:
>>> Do old snapshots get deleted automatically?
>>
>> Not implemented yet, but definitely planned. Any suggestions for
>> the default old-delete policy?
>
> Logarithmic-ish. Keep 1 a minute for 10 minutes, 1 every 10 minutes for 100
> minutes...
Something like that s
The notebook seems to save a snapshot of my worksheet every 3 minutes,
even if I'm not using the worksheet. I often leave a few worksheets
open for long periods of time, and these files build up and slow down my
home directory synchronization. Could the notebook only save a snapshot
when the pag
4) If I use GAP Print(...) commands in a short notebook entry, I see the
output. But if the entry is longer, I don't see the output.
I would add this to the trac ticket, but I don't think I have an
account.
Dan
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"William Stein" <[EMAIL PROTECTED]> writes:
> Very interesting. When you install the gap database, SAGE runs
> gap_reset_workspace() to update the cached workspace on the machine
> on which the database is installed. Because a single home directory could
> be used by multiple machines, there ar
"David Joyner" <[EMAIL PROTECTED]> writes:
> Could you please try gap_reset_workspace() and then restart SAGE
> and see if the examples start?
That fixed it! Thanks. Not sure what I did. The problem occurred on
two different systems, which my home directory is mirrored between.
If it happens
Some other minor issues about using GAP within the notebook, under
2.7.1. I've put my entire worksheet in GAP mode using the menu at
the top. The following things don't work correctly:
0) If I type something that gives an error in GAP, the error
message is buried in a python exception/backtrace
I'm having trouble accessing GAP's small groups database from the
notebook. I'm using the binary install of 2.7.1 on 32-bit Debian.
I have installed database_gap-4.4.9 and gap_packages-4.4.9_2.
If I do "sage -gap", then inside the gap process, I can do:
gap> NumberSmallGroups(2^3);
5
But if I
"David Joyner" <[EMAIL PROTECTED]> writes:
> You probably know this already but the 2003 survey
> www.math.rwth-aachen.de/~Gerhard.Hiss/Preprints/AlgoRepTheo.pdf
> discusses briefly what is/was out there. I don't think it mentions
> recent packages such as laguna, crime, and hap, but I don't know
I don't know if this is related to what the original poster wants, but
I've been wondering lately whether there is software for doing
computations in modular representation theory (where the characteristic
of the field divides the order of the group). For example, computations
in the ring kG for
[sage list added]
"Travis E. Oliphant" <[EMAIL PROTECTED]> writes:
> The SAGE people may be interested in this, but I doubt there will more
> than a handful of users of these algebraic base classes.
SAGE has quite a sophisticated type hierarchy, and a sophisticated set
of coercion methods. Wh
2.1.3 fixes the blas-related problems I had with 2.1.0.1. All tests
pass.
This is on a Debian P4 laptop, with atlas3-sse2 installed.
Dan
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"William" <[EMAIL PROTECTED]> writes:
> Robert has been doing a little preliminary work about what is out
> there, and putting it here:
>
> http://sage.math.washington.edu/home/rlmill/graph_software.html
>
> The idea of the above page is just to summarize what is currently
> available.
Could b
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