nclude MPI by default (I think), I'm doubtful that they'd
care about mpif90.
Cheers,
Tim.
---
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University of Waterloo
http://www.linkedin.com/in/timlahey
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roblems for Sage on the iPhone/iPod Touch are, a) memory since the
max memory is 256MB (I think), b) speed, and c) UI. The Sage UI isn't designed
for such a small device. The iPad is more suitable for a larger UI but
I still think it's not a good idea at the moment.
Using those four woul
version of matlab?
The problem likely is that Sage is running inside the VM and is running
on Linux while Matlab is on XP. Linux can't run a Windows command like
that. You'd have to install Matlab inside the Sage VM.
Cheers,
Tim.
---
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PhD Candidate, Systems Design Engine
On Sep 29, 2009, at 1:44 AM, Jason Grout wrote:
>
> Tim Lahey wrote:
>>
>>
>>
>> Based upon what I recall about the D notation, that's the derivative
>> of f(t) evaluated at t = 0. The f(0) tells where it's evaluated at
>> and
>> the D
ficiently simple.
> Do other programs produce easier to read derivatives while
> guaranteeing that the representation they produce is unambiguous?
The D notation is used in Maple as an option, but almost always allows
conversion to the standard notation.
C
rst
argument. I hate the notation and the change to it is why I don't really
use Sage anymore. I find it difficult to parse, and I want notation I
can use with my committee and supervisor, but I seem to have lost that
argument.
Cheers,
Tim.
---
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PhD Candidate, Systems Design Engi
> Can one use "appreciated" in English in that context ?
>
Appreciated = apprécier
---
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ssage
> about sage 3.4.1-rc1.
>
http://groups.google.com/group/sage-devel/browse_thread/thread/383dce46ede58105
Basically, the 10.5 binary should work. For 10.6, the new version of
readline is
necessary. The thread links to a Trac ticket:
http://trac.sagemath.org/sage_trac/ticket/684
d.wikidot.com/ there are some problems
with
the command line version of Matlab 2009a on Snow Leopard. I highly
doubt it's a
Sage problem.
William wrote about compiling on 10.6 in another thread.
Cheers,
Tim.
---
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PhD Candidate, Systems Design Engineering
University of Waterloo
e
> docs?
>
I'm not sure about docs, but a simple way to convert from radians to
degrees
is multiply by 180/pi since there are 180 degrees in pi radians.
---
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On Jun 17, 2009, at 7:05 AM, John Cremona wrote:
>
> I think is is easier, both on the eye and for a beginner to
> understand:
>
> sage: x = polygen(ZZ)
> sage: f = 2*x**2 - x
> sage: f.factor()
> x * (2*x - 1)
>
> The effect of the first line is that polynomials in x are elements of
> the polyn
but outside sage.
>
Sage only knows about python modules installed within its python
installation so any other python modules you want to use with it
have to be installed there.
Cheers,
Tim.
---
Tim Lahey
PhD Candidate, Systems Design Engineering
University of Waterloo
http://www.link
a sort of piecewise function):
>
> sage: heaviside(x).diff(x)
> dirac(x)
>
The derivative of the dirac delta shows up in solid mechanics, is that
defined at all?
I have major problems with Maple because its integration of Heaviside
functions is often wrong.
Cheers,
Tim.
---
Tim
On Apr 12, 2009, at 11:42 PM, pong wrote:
>
> I wrote couple sage scripts and would like to compile them in Mac OS
> 10.5. Looks like I need GCC. How can I install one? A quick search on
> the internet seems to suggest that I need to sign up as an Apple
> Developer to get a copy which I don't fee
Scipy has a routine for Toeplitz and I think it has one
for Hankel as well. I think the docs are here:
http://www.scipy.org/doc/api_docs/SciPy.linalg.basic.html
but the web site appears to be down at the moment.
However, you need to be careful in that Scipy doesn't like
Sage constants as is so
^2
f.simplify_trig()
or
f.simplify_full()
However, in my version of Sage (3.2), the functions simplify_full()
and simplify_trig() only seem to be defined on objects not as
general functions. Unless I'm missing something.
Cheers,
Tim.
---
Tim Lahey
PhD Candidate, Systems Design Engineerin
On Jan 19, 2009, at 11:42 PM, Timothy Clemans wrote:
>
> Is this similar to making it easy to post @interact demonstrations on
> webpages including a blog?
Well, there is a new Python blog engine being done by some of the
same people who did Sphinx.
http://zine.pocoo.org/
It would be nice if
to do more with them, try and convert them to Sage.
As for Octave, unless there is something specific, I highly recommend
Numpy and SciPy like William stated.
Cheers,
Tim.
---
Tim Lahey
PhD Candidate, Systems Design Engineering
University of Waterl
On Dec 18, 2008, at 5:50 AM, Robert Bradshaw wrote:
>
> It should be noted that often the easiest way to get Python with all
> those modules is to install Sage :).
>
> - Robert
>
I've certainly found that. SciPy and matplotlib I've had problems with
installation in the past so Sage definitely h
NumPy it provides numerics close to MATLAB
speeds,
Cython and other tools (see SciPy docs) provide a way to speed up
important
speed critical sections and the rest of SAGE gives you a way to derive
the equations you want to simulate. Plus, Python has a lot of tools that
you can install into Sa
On Dec 18, 2008, at 12:12 AM, Jason Grout wrote
> Oh, I understood the above to mean that you could define a matrix B,
> for
> example, without defining the elements of the matrix. I don't know
> how
> to do that in Mathematica; maybe I'm confused.
It's actually done implicitly, see:
http:/
On Dec 17, 2008, at 8:03 PM, Jason Grout wrote:
>
> Tim Lahey wrote:
>>
>> There are certainly some things you can do with general matrices and
>> vectors, but I think doing something like defining A as an nxm matrix
>> and allowing various operation
by extension vectors), apply transposes and take derivatives. This boils
down to a special case non-commutative algebra (because it needs to
support the transpose).
Cheers,
Tim.
---
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University of Waterloo
http://www.linkedin.com/in/timlahey
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function, it's an expression. Check
the type so H(4) doesn't mean anything. You could try subs and
substitute for p (I assume that's what you want evaluated at 4.
Cheers,
Tim.
---
Tim Lahey
PhD Candidate, Systems Design Engineering
University of Waterloo
http://www.linkedin.co
x27;s handy. I wasn't expecting for it to be that easy.
Thanks.
Cheers,
Tim.
---
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he name in
a list.
Is there an easy way to do this in Python? Or should
I just bite the bullet and make a class and pass an
object, instead?
Thanks,
Tim.
---
Tim Lahey
PhD Candidate, Systems Design Engineering
University of Waterloo
http://www.linkedin.com/i
Hi,
I've been going through my integral test suite and I've
ran across one integral that maxima doesn't like at all,
but FriCAS doesn't have a problem with.
var('x')
f = sin(x)/x
g = f.integrate(x)
g isn't integrated or recognized as a particular function.
However, if I do,
h = axiom.integrate(
On Dec 4, 2008, at 10:14 PM, William Stein wrote:
It would be better to call the numerical_integral function
that is already in Sage, which Josh Kantor wrote, which
is pretty sophisticated. It uses GSL and a C callback function.
Then improve the implementation of that function to also use
scip
On Dec 4, 2008, at 10:05 PM, Jason Grout wrote:
Tim Lahey wrote:
Jason
Is there an easy way to get the integrand, variable and bounds out
of the
integral? That way, if one has tried to analytically evaluate it,
they
can pull it out and try numerically evaluating it easily. In fact
y numerically evaluating it easily. In fact, it
probably could be done automatically.
Cheers,
Tim.
---
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PhD Candidate, Systems Design Engineering
University of Waterloo
http://www.linkedin.com/in/timlahey
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On Dec 4, 2008, at 7:19 PM, Jeffrey Straszheim wrote:
Tim Lahey wrote:
Oh, thanks a lot. I'll look for it. I prefer applied math texts so I
definitely appreciate the recommendation.
I don't want mislead you. It is still a pure math text. Abstract
algebra, which is where y
r. So, for
LaTeX output that's PDF and for HTML that's png. So, that shouldn't
be a problem.
Cheers,
Tim.
---
Tim Lahey
PhD Candidate, Systems Design Engineering
University of Waterloo
http://www.linkedin.com/in/timlahey
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On Dec 4, 2008, at 5:32 PM, Robert Bradshaw wrote:
On Dec 4, 2008, at 2:22 PM, Tim Lahey wrote:
Good to know. Is there a way for Sage to do a reset, along the lines
of a MATLAB clear or a Maple restart? That is, forgets all
expressions
and variables as if the session was brand new
lines
of a MATLAB clear or a Maple restart? That is, forgets all expressions
and variables as if the session was brand new?
Cheers,
Tim.
---
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PhD Candidate, Systems Design Engineering
University of Waterloo
http://www.linkedin.com/in/timlahey
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On Dec 4, 2008, at 5:13 PM, Jason Grout wrote:
Tim Lahey wrote:
The only problem I see with this is that it doesn't free up the
original. One
reason for changing the symbolic I, is to be able to use it for other
variables.
Sure it does:
sage: _j = I
sage: _j.rename("_j"
sage: f = sin(2*I) + cos(3*x); f
cos(3*x) + _j*sinh(2)
sage: f.rename('fred')
sage: f
fred
The only problem I see with this is that it doesn't free up the
original. One
reason for changing the symbolic I, is to be able to use it for other
variables.
Cheers,
Tim.
---
Tim
On Dec 4, 2008, at 4:33 PM, William Stein wrote:
On Tue, Dec 2, 2008 at 8:21 PM, Jason Grout <[EMAIL PROTECTED]
> wrote:
Tim Lahey wrote:
Hi,
Thanks. I was kind of hoping for something less drastic,
but that works. In Maple there is just a variable you can
set which controls thin
On Dec 4, 2008, at 4:09 PM, William Stein wrote:
On Thu, Dec 4, 2008 at 1:07 PM, Tim Lahey <[EMAIL PROTECTED]> wrote:
This may be a bug in Maxima, because it looks like it can do the
indefinite
integral. However, any integral that requires feedback from the
user during
the integ
integral and then evaluate at the end points. That
appears to
work so I find it interesting that Maxima can't integrate the definite
integral.
Cheers,
Tim.
---
Tim Lahey
PhD Candidate, Systems Design Engineering
University of Waterloo
http://www.linkedin.com/in/timlahey
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On Dec 4, 2008, at 7:45 AM, David Joyner wrote:
Looks like the Sage tutorial except it has a lot of exercises and
statistical
examples. There are also some cool dynamical systems examples.
I agree, that the tutorial at least needs more statisitcs.
I'm not how sure the new documentation sys
.ma.imperial.ac.uk/mathematica/download/Course.pdf
We might want to do something similar as an Intro to Sage since
it does a good job of covering a lot of things a student might
be interested in doing.
Cheers,
Tim.
---
Tim Lahey
PhD Candidate, Systems Design Engineering
University of Waterloo
http
On Dec 3, 2008, at 10:26 PM, Jeffrey Straszheim wrote:
Tim Lahey wrote:
Hi,
I'm an engineer by training, so my knowledge of
mathematics is very applied. A lot of things in
Sage deal with Groups, Rings, and Fields so I'd
like to broaden and improve my mathematics knowledge.
Cou
for. However, we need to have
a command to evaluate it at a later point in the calculations.
Cheers,
Tim.
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PhD Candidate, Systems Design Engineering
University of Waterloo
http://www.linkedin.com/in/timlahey
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pproach would be
to have an option to pass to the integrate function to hold the
evaluation
which is evaluated after calling a second function.
Cheers,
Tim.
---
Tim Lahey
PhD Candidate, Systems Design Engineering
University of Waterloo
http://www.linkedin.com/in/timlahey
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Ah,
I think I see what you're doing. Thanks for the explanation.
Cheers,
Tim.
On Dec 3, 2008, at 6:04 AM, Simon King wrote:
Dear Tim,
perhaps the following is a better explanation.
In the above situation, "for X in F" yields a list of pairs (x-1,2),
(x
+1,2) etc. In particular, X is n
On Dec 3, 2008, at 4:50 AM, Simon King wrote:
Dear Tim,
On Dec 3, 7:15 am, Tim Lahey <[EMAIL PROTECTED]> wrote:
No, because I want instead of something like
[(x-2,2),(x-3,3)]
I'd like
[(x-2)^2,(x-3)^3]
You may do this:
Start with a factorization of something:
sage: f=f
age: f = x**10-1
sage: y = var('y',ns=1)
sage: type(f)
'sage
.rings
.polynomial
.polynomial_integer_dense_flint.Polynomial_integer_dense_flint'>
sage: f(y)
y^10 - 1
sage: type(f(y))
Maybe some of that is useful ...
Oh, that is useful. Thanks. I wonder about going the rev
is shown factorized. That solves
one of my problems. Unfortunately, the partial fraction routine for
polynomials doesn't take arguments as to terms to do the expansion
over.
Cheers,
Tim.
---
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PhD Candidate, Systems Design Engineering
University of Waterloo
http://www.linkedin.c
those factors
in a partial fraction expansion.
I suppose I could do,
l = []
j = 0
while (j <= len(c)):
l.append((c[j][0])**(c[j][1]))
j = j + 1
if c is the factorization object, but I would think that
something like that would be part of the class.
Cheers,
Tim.
---
Tim L
Hi,
Thanks. I was kind of hoping for something less drastic,
but that works. In Maple there is just a variable you can
set which controls things, so you can do it on a per script
basis.
Thanks.
Tim.
---
Tim Lahey
PhD Candidate, Systems Design Engineering
University of Waterloo
http
On Dec 2, 2008, at 10:14 PM, Jason Grout wrote:
Tim Lahey wrote:
Hi,
The discussion of imaginary numbers reminded me of a
question I've had for some time. Is there a way to set
what's used for the imaginary unit? I often set it to
_j in Maple and I was wondering if there was any
Hi,
The discussion of imaginary numbers reminded me of a
question I've had for some time. Is there a way to set
what's used for the imaginary unit? I often set it to
_j in Maple and I was wondering if there was any way to
do it in Sage.
Cheers,
Tim.
---
Tim Lahey
PhD Candidate, Syst
that this interface is not consistent with the partial fraction
decomposition for symbolic expressions which is just
f.partial_fraction(). I'd still like to be able to convert between the
two.
Thanks,
Tim.
---
Tim Lahey
PhD Candidate, Systems Design Engineering
University o
ns. Is there
some way to convert between them?
Thanks,
Tim.
---
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University of Waterloo
http://www.linkedin.com/in/timlahey
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To
es, but on the Notebook level, this would mean
displaying the image as part of the command and supporting input of
the image (hopefully by drag and drop).
Cheers,
Tim.
---
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University of Waterloo
http://www.linkedin.com/in/timlahey
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so it
looks like an attractive option.
Cheers,
Tim.
---
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http://grass.itc.it/
that can do this.
Cheers,
Tim.
---
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PhD Candidate, Systems Design Engineering
University of Waterloo
http://www.linkedin.com/in/timlahey
On Dec 2, 2008, at 4:44 AM, John Cremona wrote:
>
> I don't suppose that Sage can do this? It is not clear wha
/books/gaglione-gp-thry.pdf)
> might fit the bill. Next level up from (a) might be
> (c) A First Course in Abstract Algebra, by John B. Fraleigh,
> though there are lots of choices here.
>
Thanks for these. I now have a lot of reading to do.
Cheers,
Tim.
---
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PhD Candidate, Systems
one) so I can better
understand what Sage is doing?
Thanks,
Tim.
---
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g those variables if you want.
Hope this helps. If I've misunderstood the question, could you clarify
what you want to do with them?
I recommend you look at the Python references in the Documentation
section
of the web site for more details on Python lists.
Cheers,
Tim.
---
Tim Lahey
On Nov 26, 2008, at 2:48 AM, Robert Bradshaw wrote:
>
> On Nov 25, 2008, at 11:46 PM, Tim Lahey wrote:
>
>>
>> Thanks.
>>
>> Is there a way to do this for just a single call?
>> Or is one supposed to just clear the assumption after the
>> fact (I thi
fact (I think the latter is done with forget() if I read
the documentation correctly)?
Cheers,
Tim.
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University of Waterloo
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(x/a). Is
there some way of enforcing sqrt(a^2) = a?
Thanks,
Tim.
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University of Waterloo
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ympy.sympify(f),
> sympy.sympify(x))
> sage: sympy_integrate(f1,x)
> 1/a*log(b + a*x)
>
Good to know. But, in order to get proper timings, I need to
skip the sympify inside the integrate.
Thanks,
Tim.
---
Tim Lahey
PhD Candidate, Sys
On Nov 24, 2008, at 11:54 PM, William Stein wrote:
>
> On Mon, Nov 24, 2008 at 8:27 PM, Tim Lahey <[EMAIL PROTECTED]>
> wrote:
>>
>> Hi,
>>
>> If I have the following example Sage code,
>>
>> var('x,a,b')
>> # Test 1
>>
them for SymPy as well, but those need to run
separately because of how SymPy defines its variables.
Thanks,
Tim.
---
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University of Waterloo
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that Axiom and
Sympy get correct, but Maxima "fails" because it requests additional
information during the integration:
var('x,a,b,n')
f22 = (a*x+b)^n
aa = f22.integrate(x)
In fact, SymPy gets the same answer as Schaum's while FriCAS needs
a rewrite rule applied to the re
On Nov 24, 2008, at 9:51 PM, Mike Hansen wrote:
>
> You can do this in 3.2:
>
> sage: s = timeit.eval("2+3")
> sage: s
> 625 loops, best of 3: 942 ns per loop
> sage: s.stats
> (625, 3, 3, 942.230224609375, 'ns')
>
> The code is in sage/misc/sage_timeit.py and sage/misc/
> sage_timeit_class.py.
t do it.
Where can I find this in the source so I can see how it is doing it?
Thanks,
Tim.
---
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University of Waterloo
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To
> William
>
No problem. Once it's done it should help as automated tests for both
monitoring performance and correctness. I'll be happy to donate them
to the cause. It's going to take a while.
The timeit routines give results that look like:
5 loops, best of 3: 50 ms per loop
Does
On Nov 24, 2008, at 8:45 PM, William Stein wrote:
>
> On Mon, Nov 24, 2008 at 4:46 PM, Tim Lahey <[EMAIL PROTECTED]>
> wrote:
>>
>> Hi,
>>
>> Is there a specific way to add rules (and apply them) to rewrite
>> expressions in Sage?
>>
>>
ation tests for both correctness and timing.
Thanks,
Tim.
---
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University of Waterloo
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algebraic case.
>
Thanks. It looks like my library has both regular and electronic
versions so I'll
take a look. The first case might be easier now with the new symbolics
and the pattern matching it has. It seems like looking at FriCAS is a
good idea too.
Cheers,
Tim.
---
Tim Lah
On Nov 23, 2008, at 3:39 AM, William Stein wrote:
>
> On Sat, Nov 22, 2008 at 10:56 PM, Tim Lahey <[EMAIL PROTECTED]>
> wrote:
>> As for the option to use Maple/Mathematica, I think as long as there
>> is relatively good conversion of expressions, it's best
I certainly have quite an interest in this area, so I'd appreciate any
references people might suggest. Not that I'm saying I'd tackle this,
but I'd like to learn more.
Cheers,
Tim.
---
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PhD Candidate, Systems Design Engineering
University of Waterloo
--~--~---
ped Maple, I probably can
get any relevant books/papers.
Cheers,
Tim.
---
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University of Waterloo
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standing that Axiom is best in breed for integration, so
it may be best to use that.
Cheers,
Tim.
---
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University of Waterloo
--~--~-~--~~~---~--~~
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On Nov 23, 2008, at 1:01 AM, William Stein wrote:
>
> On Sat, Nov 22, 2008 at 9:34 PM, Tim Lahey <[EMAIL PROTECTED]>
> wrote:
>>
>> As a fellow Maple user, I highly recommend that you look at the new
>> symbolics in Sage, pynac. While support is still incomp
e documents, I'd export individual results to LaTeX
using my modified version of Maple's LaTeX exporter (available on my
blog on the Mapleprimes site) which allowed me to customize how things
got exported using regular expressions.
Cheers,
Tim.
---
Tim
ighly recommend that you look at the new
symbolics in Sage, pynac. While support is still incomplete, it has
capabilities more similar to Maple than the Maxima-based symbolics.
It also tends to be much faster than the Maxima symbolics too.
Cheers,
Tim.
---
Tim Lahey
PhD Candidate, Systems Design Engineer
ting 2 variables.
>
Well, it isn't surprising that it can't do it since there are four
values in your desired plot (x,y,z, and f). The problem is that there
are multiple ways of plotting it.
However, there should be a way of plotting these kind of functions, I
don't know i
there is(are) paper(s) that discuss it. The main problem is that
someone doing this would need to be fairly familiar with Sage internals.
Cheers,
Tim.
---
Tim Lahey
PhD Candidate, Systems Design Engineering
University of Waterloo
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On Oct 14, 2008, at 3:58 PM, William Stein wrote:
The student who was going to do a Sage TextMate plugin ended
up doing a project on something else instead. You might get some
mileage from using the PYthon plugin -- I don't know.
sage-support: Any other TextMate users out there?
I use Tex
l for visualizing Sage.
Cheers,
Tim.
---
Tim Lahey
PhD Candidate, Systems Design Engineering
University of Waterloo
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I don't know if it is possible with the normal plotting tools, but PyX
supports LaTeX in plots. I think it is available as an optional package.
Tim.
On Oct 6, 2008, at 12:08 AM, [EMAIL PROTECTED] wrote:
Is it possible to add Latex equations to Sage plots?
Chris
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---
Tim Lahey
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University of Waterloo
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e specific features rather than
the notation.
I'd considering using Maxima directly if I only needed a CAS,
but Sage provides me with Scipy as well.
Cheers,
Tim.
---
Tim Lahey
PhD Candidate, Systems Design Engineering
University of Waterloo
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e for more than differentiation and
integration, I'm not that concerned about, but it can
be implemented in a similar manner if we have a state
variable.
Cheers,
Tim.
---
Tim Lahey
PhD Candidate, Systems Design Engineering
University of Waterloo
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dicate an integral which
is evaluated at that time.
(2)
sage: A = Integral(x,x,0,1)
sage. latex(A)
\int_0^1 x\, dx
sage: A
Integral(x,x,0,1)
I don't really care which syntax is used, as long as there is a
consistent way of doing this.
Cheers,
Tim.
---
Tim Lahey
PhD Candidate, Systems
Hi,
Maple has a really useful feature of inert integrals
and derivatives. Basically, the integrals and derivatives
show up in the equations, but aren't evaluated until
a command to evaluate them is explicitly given. So,
you can delay the evaluation until after you've processed
the expression to t
On Jul 22, 2008, at 12:27 PM, Harald Schilly wrote:
>
> On Jul 21, 10:50 pm, Tim Lahey <[EMAIL PROTECTED]> wrote:
>> Lastly, if the ability to work with symbolic vectors/matrices was
>> added,
>> a nice thing to have would be to work with partitioned matric
ly, if the ability to work with symbolic vectors/matrices was added,
a nice thing to have would be to work with partitioned matrices and
vectors. For example:
A = [[ B, C],[D, E]]
where B, C, D, and E are general sub-matrices. This crops up all the
vectors in advance since it is dependent upon the number
of
elements you choose. They have a definite structure, so once the size is
specified, you can then fill in the vectors, but you don't specify the
size
in advance. The most you would do is say that A i
t git has a git-svn gateway, I'm not
>> sure if Mercurial has the same.
>
> It's easiest to use XCode's editor, and I think subversion is the way
> to go. I cannot set up a subversion server at my college, but I can
> try to do it on my cohomology.com server.
&g
Perforce version control, but does
> not explicitly support Mercurial.
>
If you use TextMate for your coding, there is a Mercurial bundle (and
a XCode bundle). Alternatively, we probably could set up a Subversion
repository somewhere. I know that git has a git-svn gateway, I'm not
sure
r Leopard, it may be best to wait until
Leopard is released.
Tim Lahey
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