Dear all, I'm trying to plot an implicit function with a y-axis range
three orders of magnitude greater than the range of the x-axis.
If I use logarithmic scale, the resulting plot is the one shown in
sage0.png... However, when a linear scale is used, the plot collapses
(see the file
I found the answer... to use the option aspect_ratio='automatic'
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I found the answer... to use the option aspect_ratio='automatic'.
Thank you!
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Hi dear community:
I've seen the examples given in the homepage of
sagemanifoldshttp://sagemanifolds.obspm.fr/examples.html,
and still have not a clue about how to use (or define) a general
connection, because all the examples work with the Levi-Civita connection.
Does anyone knows how to
Impressive work! I started improving my programming skills to try
implementing the Hodge star on DifferentialForms, I see you went much
further!
I'll immediately install the package, working on several examples, and asap
start contributing with it!
Congratulations!
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https://lh4.googleusercontent.com/-0IDPoNIN3ko/Udq6gYqcLMI/PEo/Smdr5rsJse8/s1600/SM_doc.png
I just installed SageManifolds package, and tried
sage: Chart?
to review the documentation, and the format is not OK, Is it just me or a
documentation `bug`?
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I'm trying to reproduce the examples in the page, starting with
Schwarzschild spacetime
So far I'm getting the following:
* When defining a `Chart`, say `X`, t
from manifolds.all import *
M = Manifold(4, 'M', r'M'); M
X = Chart(M, r't, r:positive, th:positive:\theta, ph:\phi', 'BL')
X
does not
Thx Michael, I didn't know that feature of sage notebook!
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I could try to change something... However, What is the way to provide a
patch? Is it through github?
On Friday, 28 June 2013 09:36:47 UTC-4, Joris Vankerschaver wrote:
Symbolic expressions have a .is_trivial_zero() method which is more
suitable for use here. It doesn't try anything
Dear developers,
I was looking through the class DifferentialForm, and there is a note in
the `__eq__` method pointing that ...most of the execution time is spent
in cleaningpu the differential forms
def __eq__(self, other):
if type(other) == type(self):
if self._degree
Great work! Congratulations!
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Hi David,
Thank you for pointing out such an interesting feature of SymPy. I've been
checking the documentation, and it seems to do nice things, but I feel it a
bit extrange... the notation and the usage in not quite clear.
Although I tried some of the examples in the documentation and got no
Dear all,
I've asked in asksage how to define a Clifford
Algebrahttp://ask.sagemath.org/question/2155/defining-clifford-algebras.
Benjaminfjones has suggested I start by looking at the Quaternion algebras
https://github.com/sagemath/sagelib/tree/master/sage/algebras/quatalgcode,
while Burcin
Dear all,
I'm interested in defining the anti-commutator (function or method) for
matrices. I look up the definition of the commutator, and it's very simple
def acomm(self,other):
return self*other + other*self
providing (of course) the additional information about the usage.
However I
Thank you for the tip! That's an impressive command.
Cheers.
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Thank you Simon, a very complete answer to my problem.
I've already tested my definition and is fantastic.
Cheers!
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Dear community:
I was doing some simple linear algebra calculations, and since the output
was a long list, Sage gave me a few lines with the option of looking at the
full_output.txt file.
I noticed that after changing the variables, and rerun the calculation the
full_output.txt is now getting
Sorry It's not getting updated.
On Monday, 8 October 2012 12:14:42 UTC-3, Simon King wrote:
Hi!
On 2012-10-08, Dox o.castill...@gmail.com javascript: wrote:
--=_Part_110_6376496.1349698687928
Content-Type: text/plain; charset=ISO-8859-1
...
I noticed that after changing
Yes Nils, In fact it was a browser problem. William makes me notice it.
Thank you all.
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?
Thank you!
P.D.: Additionally I would like to compile the source for a i7 intel, How
many cores should I tell ATLAS to use, 4 or 8?
DOX
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Thank you Jan, It worked.
I'll compile the source, but I have a doubt, How many cores are in a i7? 4
or 8?
Dox
On Wednesday, 27 June 2012 16:49:41 UTC-4, Jan Groenewald wrote:
Hi Dox,
On 27 June 2012 22:16, Dox wrote:
Dear all:
I bought a new laptop yesterday, and it has arch. 64-bits
it?
* Where should it be included as a class? (in case it is possible)
Thank you!
DOX
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product and gives and
scalar, instead of a matrix.
How can this be solved?
Thank you guys!
DOX.
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Thx, this is it!
On Jan 24, 12:01 pm, David Joyner wdjoy...@gmail.com wrote:
On Tue, Jan 24, 2012 at 9:57 AM, Dox o.castillo.felis...@gmail.com wrote:
Hi everyone,
Today I rediscover a problem with the product of vectors.
I've defined two vectors u1 and u2,
sage: u1 = vector([a,b,c
...@creativetrax.com wrote:
On 1/24/12 8:57 AM, Dox wrote:
Hi everyone,
Today I rediscover a problem with the product of vectors.
I've defined two vectors u1 and u2,
sage: u1 = vector([a,b,c])
sage: u2 = vector([d,f,g])
then I try to construct the matrix u1*u2.column()
sage: M = u1*u2
You're very right! Sorry
On Jan 24, 1:06 pm, Jason Grout jason-s...@creativetrax.com wrote:
On 1/24/12 9:56 AM, Dox wrote:
Hi Jason,
Thank you for the suggestion. Nonetheless, the first does not work...
I venture to guess that SAGE understand the product (*) as commutative
for vectors
the singular behaviour by looking at it!
Thx.!!!
Dox
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Hi Benjamin,
Yes, I'd like to get an automatic plot like that, where the singularity can
be seen. For example, if I try
sage: var('x')
sage plot(1/x, (x,-2,2), detect_poles=False)
the singularity is shown. But it does not work with the delta distribution.
Any suggestions?
Dox
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Hi kcrisman,
A very useful command that spike_function, but I still don't get how to use
it as a delta_function, Could you help me with an example? say,
delta_function(log(2+sin(x)))
Thank you,
Dox
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Thx kcrisman!
very useful workaround.
Dox
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URL: http
Hi group!
I was trying to integrate a dirac_delta, but SAGE cannot do so... weird
thing, 'cause that `function' is defined, and in only make sense as part of
an integration.
Cheers.
Dox.
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Hi again list,
This time I come with a problem of solving an algebraic expression, the
solution has the variable x on it!
sage: reset()
sage: var('x')
sage: var('mp', latex_name=rm_\pi)
sage: var('me', latex_name=rm_e)
sage: f(x) = mp - sqrt(x^2 + me^2) - x
sage: solve(f(x)==0, x)
[x == mp -
Hi group,
I know that for a given expression it's possible to translate it to LaTeX.
Is it possible to translate it to python?
Say, from x^2*arctan(x) get x**2*atan(x)
Thx.
Dox.
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Hi Simon, thank you for your quick answer, It's almost what I expected, but
in fact the arctan function is denoted by atan in python. Of course it's
possible to correct it by hand, but it's easy to mistype when the
expressions are too complicated.
Dox.
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Looks nice... Thx for the recommendation.
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URL:
. Finding the differentials, dx and dy
4. Compute dx^2 + dy^2
Is it possible to define differentials of functions? If so, How?
Thx.
DOX
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Thank you very much guys!
Dox.
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URL: http
Hi everyone!
I'd like to know if there is a way of finding the series expansion of a
given function around zero and infinity, Is it possible?
I tried with sympy.series, didn't work
sage: reset()
sage: from sympy import *
sage: r = Symbol('r')
sage: sympy.series(2*r/sinh(2*r), r)
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Wow!
A lot of answers!
Thank you everyone, :-) nice to see so much different contributions!
Dox
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Any other contribution?
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URL: http://www.sagemath.org
Thank you Mike! :-)
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URL: http://www.sagemath.org
Hi guys!
Short question! Is there any function equivalent to the *Levi-Civita*
symbol?
I found *Eijk* in sympy... but seems to work only in 3-dimensions.
Thank you!
Dox
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Hi again people!
Just wanted to know if the Levi-Civita tensor can be emulated by using this,
sage: G = SymmetricGroup(4)
sage: G([4,2,3,1]).sign()
-1
because I'm not sure if the notation used in the documentation is equivalent
to mine!
Thx.
Dox
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Wow!!!
Jason, you're a genius!!! :-)
Thank you for such a complete answer. Now I'll try to define my own
class... :-P
Dox.
On Feb 10, 3:42 am, Jason Grout jason-s...@creativetrax.com wrote:
On 2/9/11 9:18 PM, Robert Bradshaw wrote:
On Wed, Feb 9, 2011 at 6:43 PM, Doxo.castillo.felis
( 5, World!)
sage: B+C
( 9, World!)
I'm thinking could be a bit hard, since the function I'm defining has
not a string but a matrix as second entry. The first is not a number
either.
Thx.
Dox.
On Feb 10, 3:42 am, Jason Grout jason-s...@creativetrax.com wrote:
On 2/9/11 9:18 PM, Robert Bradshaw
of the most important part of the
class.
Any additional help is welcome!
DOX
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with values in different elements of the
algebra.
** Define the product of the forms by a number (or function)
Cheers
DOX
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is (12, HelloWorld!!)
Something like that!
Thank you all
;-)
Dox
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begin?
I've already got SAGE 4.6.1 src.
Regards!!!
Dox.
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Hi everyone,
Today I was writing a SAGE tip for my blog, about using customized
ticks in plots, and I realize that,
sage: p = plot(sin(x), (x, -7, 7), ticks=pi/2, tick_formatter=pi,
axes_labels=['$x$','$\\sin(x)$'], fontsize=14, color='red')
sage: p.save('/home/me/fig1.pdf')
sage: q =
Hi guys! I have an easy question... got an expression with
exponentials, say exp(x)+exp(-x), How can I get the result in terms of
hyperbolic functions?
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Thank you very much Francois, much more explicit than I expected!!!
On Jan 23, 4:39 pm, Francois Maltey fmal...@nerim.fr wrote:
Dox a crit :
Hi guys! I have an easy question... got an expression with
exponentials, say exp(x)+exp(-x), How can I get the result in terms of
hyperbolic
Hi guys!
I was wandering... Is it possible to choose the `angle of viewing' a
3D plot at the time of saving it?
Thank you.
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