If you're using the notebook interface, consider using chrome instead of
firefox, as the latter is a massive memory hog when it comes to sage.
I find that sage + notebook typically needs a good 2GB of memory in order
to run smoothly.
On Friday, August 31, 2012 9:20:14 PM UTC+1, Guilherme Boavia
If I run the following code
sage: var('x epsilon ')
sage: y=x+epsilon
sage: print y
the output is
epsilon + x
I would like the output to be
x + epsilon
In short I want to change the ordering of variables in printed results. Is
this possible? In particular, I would like x to have higher prio
Upgrading to sage 5.1 did indeed fix the arrow issue. A note on this: In
5.1 the default size for images is significantly larger, but this is
controllable through figsize.
As it turns out, matplotlib does not support arrows in axes. I cannot
fathom why, but it just doesn't unless you rip out th
The current support for arrows in sage plots currently isn't very
satisfactory. Arrows have odd behaviour, and "fat" heads with no obvious
styling options. The following code
arrow2d((0, 0), (2, 3), color="red")+point((2,3))
Generates an arrow, but the head does not reach the required point, an
==
I hope this is useful
On Friday, June 1, 2012 4:22:13 PM UTC+1, ObsessiveMathsFreak wrote:
>
> While the "ticks=" option in plot can be used to place custom tick marks
> on plot axes, how would you go about putting custom labels on each tick
> mar
On Friday, June 1, 2012 4:22:13 PM UTC+1, ObsessiveMathsFreak wrote:
>
> While the "ticks=" option in plot can be used to place custom tick marks
> on plot axes, how would you go about putting custom labels on each tick
> mark, preferably latex ones,. e.g. $x_0$, $x_1$, e
(P0+PX_LABELS+PY_LABELS)
I think that such functionality should eventually be part of plot by
default.
On Friday, June 1, 2012 7:50:19 PM UTC+1, Michael Orlitzky wrote:
>
> On 06/01/12 13:26, ObsessiveMathsFreak wrote:
> >
> > The pro
On Friday, June 1, 2012 4:48:51 PM UTC+1, kcrisman wrote:
>
>
>
> On Friday, June 1, 2012 11:22:13 AM UTC-4, ObsessiveMathsFreak wrote:
>>
>> While the "ticks=" option in plot can be used to place custom tick marks
>> on plot axes, how would you go
Sage doesn't seem to like these
f(x,y)=pi*x^10*y+3*x
B=f(x,y).polynomial(SR)
print B.coefficients()
Traceback (click to the left of this block for traceback)
...
TypeError
What's going wrong here? Is there any way to get Sage to give back
[pi,3]
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Is there really no way of doing this?
On Feb 8, 10:38 pm, ObsessiveMathsFreak
wrote:
> I have a certain integration result which Sage is currently unaware of. I
> need a way to make sage aware of it in some fashion, via substitution or
> anything else.
>
> For example, sage c
mortals to work with
polynomials without having to declare polynomials rings over
integers. )
On Feb 19, 12:12 pm, ObsessiveMathsFreak
wrote:
> Is there any way to get this code to deal with non integer
> coefficients. Specifically, can it return coefficients that are
> symbolic.
>
>
have this code consider 'a' not as a variable but as
a constant?
On Feb 9, 10:36 pm, ObsessiveMathsFreak
wrote:
> Are you certain that these two functions return elements in the same
> order?
>
> On Feb 8, 11:40 pm, Mike Hansen wrote:
>
>
>
>
>
&
Are you certain that these two functions return elements in the same
order?
On Feb 8, 11:40 pm, Mike Hansen wrote:
> On Wed, Feb 8, 2012 at 3:29 PM, ObsessiveMathsFreak
>
> wrote:
> > Is there no way of getting sage to give back the degree's of the
> > corresponding m
Currently the code for obtaining the coefficients of a multivariate
polynomials returns only a list of coefficients without returning the
degrees as well. For example
f(x,y)=10*x^2*y+3*x
B=f(x,y).polynomial(SR)
print B.coefficients()
[10, 3]
f(x,y)=10*x^100*y+3*x
B=f(x,y).polynomial(SR)
print B.
I have a certain integration result which Sage is currently unaware of. I
need a way to make sage aware of it in some fashion, via substitution or
anything else.
For example, sage currently cannot perform the following integral
sage: var(' k t')
sage: integrate(sqrt(1-k^2*sin(t)^2),t,0,pi/2)
in
Currently, the following does not work for multiple functions
sage: plot([r,r^2],(r,0,3),color=['red','blue'])
Traceback (click to the left of this block for traceback)
...
ValueError: color list or tuple '['red', 'blue']' must have 3 entries,
one for each RGB, HSV, HLS, or HSL channel
And tryin
> If anything, we've probably been too cavalier with our use of Maxima's
> fine-grained simplification and other routines at times; it seems
> dangerous to go the other way.
>
> At the same time, we have
>
> sage: integrate(x^n,x,algorithm='sympy')
> x^(n + 1)/(n + 1)
OK, this is a lot more usab
My specific problem is that it would have been a lot faster for me to
just evaluate this integral by hand, as at least I would have the
answer by now.
I don't really know what to say at this point except that sage could
be a lot easier to use right now than it currently is. I bring up this
example
This is pretty infuriating.
sage: forget()
sage: assume(theta,'real')
sage: exp(I*theta).real()
e^(-imag_part(theta))*cos(real_part(theta))
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I have complex formulas involving several occurances of complex
exponentials. e.g. e^(2*I*theta), e^(3*I*theta)
I would like to find the real part of the expression (there are
several variables), but when I do so, the expression becomes unwieldy
with a lot of terms like
sin(-2*real_part(theta)) sh
I'm currently looking to draw graphs of electric field lines for
arrangments of several charges. Is there a standard way of doing this
in sage?
The equipotential lines can be draw straightforwardly using
countor_plot, but how can the electric field lines--which are
orthogonal trajectories of the e
I want to use sage to investigate the action of a group on a
particular "set" which is being permuted. Specifically I want to look
at the orbits of particular objects under the action of the group.
The group I'm looking at is the symmetry group of the square:
G=DihedralGroup(4)
I want to apply t
I think you should definitely get rid of the try/except statements.
The conversion is either going to work, or it is not, so you really
don't need them and they're probably slowing everything down a LOT.
If the database is very large, you might want to consider converting
outside of sage, with a c
This is actually a huge problem for me as I need to transfer sage
notebooks between different computers. Some individual sws files I
have are upwards of 60MB each!
I have often found that the best way to deal with this is to go into
the "Edit" section--at the top of the worksheet--and then copy an
You can also get fancy with the "region" option to obtain cut away
plots of the surfaces.
implicit_plot3d(x^2 + 2*y^2 + 2*z^2 == 1,(x,-1,1),(y,-1,1),
(z,-1,1),color='red',region=lambda x,y,z: x<0 or y<0 )
On May 10, 10:12 am, ancienthart wrote:
> var('x,y,z')
> A = implicit_plot3d(x^2 + y^2 + z^
I was wondering whether it was possible to use coordinate transforms
in implicit_plot3d in the same was as for plot3d?
For example, the following produces a sphere
sage: u, v, w = var('u v w')
sage: spherical=(w*cos(u)*sin(v),w*sin(u)*sin(v),w*cos(v))
sage: plot3d(2,(u,-pi,pi),(v,0,pi),transforma
documentation on sage integration is just too
> > scant.
>
> > I will just have to make do with implicit_plot3d and the like. I was
> > wondering if there is any way of integrating an implicit_plot3d plot
> > and a "slice" image plot of the function together as
slice" image plot of the function together as in this Mayavi
example
http://code.enthought.com/projects/mayavi/docs/development/html/mayavi/mlab.html#visualizing-volumetric-scalar-data
On May 7, 12:28 am, ObsessiveMathsFreak
wrote:
> Well, I finally managed to install these packages, bu
he others give various different errors. For instance, I'm
> > encountering the "allow-hosts" error seen in this thread
>
> >http://groups.google.com/group/sage-support/browse_thread/thread/b634...
>
> > But I don't even know if it was resolved in that threa
ow if it was resolved in that thread or not.
IS there a way of getting any of these packages installed? Should I
update my sage installation to a newer version(currently 4.6.2)?
On May 5, 8:24 pm, kcrisman wrote:
> On May 5, 1:43 pm, ObsessiveMathsFreak
> wrote:
>
> > Thanks but, th
te:
>
>
>
>
>
>
>
> > On May 5, 12:25 pm, ObsessiveMathsFreak
>
> > wrote:
> > > I currently have a function of three variables w=f(x,y,z), which I
> > > would like to plot in 3D if possible (e.g. via coloured plots)
>
> > > Does sage
I currently have a function of three variables w=f(x,y,z), which I
would like to plot in 3D if possible (e.g. via coloured plots)
Does sage currently have support for plotting such functions?
plot_vector_field3d has support for plotting vector fields of three
variables, but there does not seem to
On May 4, 6:02 am, Felix Lawrence wrote:
> Given that Sage doesn't do its computations in the browser, I think
> that OpenCL/CUDA would be more useful than WebGL for calculations.
> However, WebGL visualisation for 3D plots would be really, really cool.
More than just "cool", it's practically a n
?
On Apr 17, 11:44 pm, ObsessiveMathsFreak
wrote:
> Thanks, but I have to say that I don't find any of these solutions
> particularly endearing.
>
> Is there no way of coercing this behaviour out of the normal Sage
> plot3d functions? I'm not keen on having to learn yet an
7, 7:45 am, achrzesz wrote:
> http://ask.sagemath.org/question/335/multiple-3d-plots-in-one-panel-g...
>
> On 17 Kwi, 02:46, ObsessiveMathsFreak
> wrote:
>
>
>
>
>
>
>
> > Currently in sage 3D I can graph 3D plots in the same output, but not
> > side by side
Currently in sage 3D I can graph 3D plots in the same output, but not
side by side.
p1=plot3d(lambda x, y: x^2 + y^2, (-2,2), (-2,2))
p2=plot3d(lambda x, y: x^2 - y^2, (-2,2), (-2,2))
(p1).show(viewer="tachyon")
(p2).show(viewer="tachyon")
With 2d plots, this can be done using graphics array, but
On Apr 16, 4:33 am, kcrisman wrote:
> In this case, you can reinstall the sagenb spkg, I think. Let us know
> if that works. The Jmol upgrade is still experimental, though
> definitely wending its way toward completion...
>
> On Apr 15, 9:51 pm, ObsessiveMathsFreak
>
&g
On Apr 16, 9:52 pm, nkulmati wrote:
> Hello All,
>
> I have a simple script:
>
> > G = graphs.RandomNGP(20, 0.05)
> > centralities = G.centrality_closeness()
>
> I can not figure out how to plot the graph G so that no only the
> labels (1,2,3) are shown but also the corresponding centralities fro
How can installed optional spkgs be removed from the current sage
installation. I have installed an jmol upgrade package which has
failed to work and now I'd like to revert to whatever the previous
version was. Is this possible?
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On Apr 12, 8:52 pm, ObsessiveMathsFreak
wrote:
> On Apr 12, 3:51 am, kcrisman wrote:
>
> > > > Or simply legendre_P, legendre_Q
>
> > > Unfortunately, these functions do not support non integer values of n,
> > > i.e. they don't support generalis
On Apr 12, 3:51 am, kcrisman wrote:
> > > Or simply legendre_P, legendre_Q
>
> > Unfortunately, these functions do not support non integer values of n,
> > i.e. they don't support generalised legendre functions, which is what
> > I need.
>
> Are gen_legendre_P and gen_legendre_Q okay? These are a
I'm using the graph theory modules and I have a need to draw curved
edges in certain graphs. For example, to draw the complete graph K_4
as a planar graph, it's sometimes useful to draw a curved edge looping
around the main figure than to redraw the whole figure as a triangular
graph.
Currently, t
The mpmath import seems to work, but I am unable to plot the resulting
functions. I get an error about too many values to unpack.
from mpmath import *
plot(lambda x: legenp(1,0,x),(x,-1,1))
Traceback (click to the left of this block for traceback)
...
ValueError: too many values to unpack
On Ap
On Apr 10, 4:46 pm, John H Palmieri wrote:
> On Sunday, April 10, 2011 6:36:08 AM UTC-7, Marshall Hampton wrote:
>
> > Finally, what I do currently is to use ffmpeg. Because of patent and
> > license issues I think this cannot be part of the standard Sage, but
> > it does a great job and is very
Ugghh It looks like scipy wasn't quite what I was looking for. All
I really need is a way of evaluating generalised legendre functions of
the first and second kind. I've actually found a package in sympy that
does this
http://docs.sympy.org/dev/modules/mpmath/functions/orthogonal.html#mpmath.l
I'm completely unable to get the scipy special functions module to
work. In addition, it seems to cause chaos on my system once imported
sage: import scipy
sage: from scipy.special import *
sage: scipy.special.lpn(1,1)
---
Va
riday, April 8, 2011 11:03:14 AM UTC-7, ObsessiveMathsFreak wrote:
>
> > I have a python type function taking two variables is defined in such
> > a say that accidental evaluation is a possibility. Here is a
> > simplified version
>
> > def h(x,n):
> &
51:03 PM UTC-7, ObsessiveMathsFreak wrote:
>
> > That worked, thank you. But I don't understand why the standard
> > notation has so many problems. What exactly is going wrong?
>
> I think this is what's going on: if you start with this:
>
> > > def h(x,n):
That worked, thank you. But I don't understand why the standard
notation has so many problems. What exactly is going wrong?
On Apr 8, 8:00 pm, John H Palmieri wrote:
> On Friday, April 8, 2011 11:03:14 AM UTC-7, ObsessiveMathsFreak wrote:
>
> > I have a python type function tak
I have a python type function taking two variables is defined in such
a say that accidental evaluation is a possibility. Here is a
simplified version
def h(x,n):
if x>2:
return n-x
else:
return n*x-2
How can functions like this be plotted over x for a constant
,(p1,p1)))
G.show(figsize=[8,8])
Traceback (click to the left of this block for traceback)
...
KeyError: 'pop(): dictionary is empty'
On Apr 8, 5:54 pm, ObsessiveMathsFreak
wrote:
> I'm encountering a problem with graphics_array and latex use in plots.
> The following comm
I'm encountering a problem with graphics_array and latex use in plots.
The following command works fine
p1=plot(x^2, (x, -pi, pi), color='blue')
G=graphics_array(((p1,p1),(p1,p1)))
G.show(figsize=[8,8])
But if latex code is added to the plot legend it produced and error
p1=plot(x^2, (x, -pi, pi)
I'm currently using sage across multiple computers but I'm having a
problem in saving and transferring worksheets between computers.
Specifically, my problem is that when a worksheet is saved and then
loaded, the load creates and entirely new worksheet with the same name
instead of simply overridi
I was having a problem with sage when trying to animate large images
with many frames. Essentially, when the image was either being shown
or saved to a gif file, the Imagemagick convert process would consumes
gigabytes of memory, go out to swap, and the whole system would grind
to a halt.
I manage
13 pm, Mike Hansen wrote:
> On Fri, Apr 1, 2011 at 8:08 PM, ObsessiveMathsFreak
>
>
>
> wrote:
> >> sage: [0,0.2,..,1]
> >> [0.000, 0.200, 0.400,
> >> 0.600, 0.800, 1.00]
>
> >
> sage: [0,0.2,..,1]
> [0.000, 0.200, 0.400,
> 0.600, 0.800, 1.00]
May sage installation appears to be having trouble with this syntax
OK Here
sage: [0.0,0.2,..,0.9]
[0.000, 0.200, 0.400,
0
I'm just wondering if there is a canonical (i.e. convienient(i.e.
lazy)) way to define simple sequences and series in sage. In
particular, is there a standard way to define recursive series?
Suppose for example that You wanted to define the series a_n=1/n^2. Is
there a way to do this without writi
Perfect. That was exactly what I needed.
On Mar 28, 4:11 pm, achrzesz wrote:
> If you mean complete elliptic integrals of the second kind then:
>
> sage: from scipy.special import ellipe
> sage: time pts=[ellipe(1.0/(1.0+0.01*k)) for k in range(1,101)]
> CPU times: user 0.01 s, sys: 0.00 s, tota
> sage: %time pts=maxima('makelist(elliptic_ec(0.01*k),k,0,100)')
> sage: pts0=map(n,pts)
I'm not clear on what's happening here. I take it that the first call
is bypassing overheads associated with multiple maxima calls. The
second command does not work for me however.
In any case, my current pr
The standard code to compute elliptic integrals in sage appears to be
_very_ slow numerically. To compute the complete elliptic integral on
100 points in the unit interval takes about 16 seconds for me.
sage: %time pts=[ elliptic_ec(m) for m in
srange(0,1,0.01,include_endpoint=True)]
CPU times: us
Mar 28, 2011 at 7:28 AM, ObsessiveMathsFreak
>
> wrote:
> > This is a simple question, but I can't find anything in the
> > documentation about it.
>
> > I would like to declare a simple arithmetic sequence in sage. I use
> > this a lot for discrete plots, et
This is a simple question, but I can't find anything in the
documentation about it.
I would like to declare a simple arithmetic sequence in sage. I use
this a lot for discrete plots, etc. In octave, syntax such as
[0:0.1:1] returns the sequence
0.0 0.2 0.4 0.6 0.8 1.0
Is there such a sho
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