Thanks for helping. I am trying to compute (not numericaly!) the roots
of a quadratic equation build from lagrange_polynomial()...
sage: p2 = SR(-3/4*pi)*x^2 + SR(7/4*pi)*x
sage: p2.roots(x)
[(7/3, 1), (0, 1)]
Now we are back to the original question: Why the following rise a
type error?? I
I guess that the problem comes from the type of p1, not
being an Expression. So is it possible to cast this p1 to the
Expression class?
A direct conversion like the following works:
sage: p3 = 0
sage: for c in p1.coeffs():
: p3 = x*p3 + c
:
sage: p3
-3/4*pi + 7/4*pi*x
sage:
Thanks for helping. I am trying to compute (not numericaly!) the roots
of a quadratic equation build from lagrange_polynomial()...
sage: p2 = SR(-3/4*pi)*x^2 + SR(7/4*pi)*x
sage: p2.roots(x)
[(7/3, 1), (0, 1)]
Now we are back to the original question: Why the following rise a
type error?? I
Hi,
yesterday I have updated our sage Server using sage -upgrade.
It took some time, but everything worked without any problems.
Today I wanted to start the notebook for all users here and
I was asked to convert the notebook files.
Ok I accepted and all files were converted. A new admin password
On Mon, Jun 21, 2010 at 11:38 PM, Koch Peer-Joachim
koch.peerjoac...@googlemail.com wrote:
Hi,
yesterday I have updated our sage Server using sage -upgrade.
It took some time, but everything worked without any problems.
Today I wanted to start the notebook for all users here and
I was asked
Hi,
we have a good backup system ;)
I'll try a few things first, but if nothing is working-
where should I place the tar ball ?
Bye, Peer
2010/6/22 William Stein wst...@gmail.com
On Mon, Jun 21, 2010 at 11:38 PM, Koch Peer-Joachim
koch.peerjoac...@googlemail.com wrote:
Hi,
yesterday I
Dear all,
I have a continuous real function defined on the plane and I want to
plot its iso-level sets in very contrasted colors in order for these
levels to really show. The result could be in 2D or 3D. I am currently
using list_plot3d and jmol.
What are the options to pass to 2D or 3D viewers
Dear Frederic,
Would the options to contour_plot be of help? For instance,
sage: contour_plot?
snip
* ``cmap`` -- a colormap (default: ``'gray'``), the name of a
predefined colormap, a list of colors or an instance of a
matplotlib Colormap. Type: ``import matplotlib.cm;
Hi,
I think following is a bug -
sage: from scipy import sparse
sage: a = sparse.lil_matrix((10,10))
sage: a[1,2] = 1
---
ValueErrorTraceback (most recent call
last)
On Tue, Jun 22, 2010 at 8:25 AM, Rajeev rajs2...@gmail.com wrote:
Hi,
I think following is a bug -
sage: from scipy import sparse
sage: a = sparse.lil_matrix((10,10))
sage: a[1,2] = 1
---
ValueError
Dear all,
Here's my problem: I've written a function (the scource code below),
which should compute the scalarproduct of two classfunction of a group
G. But there is a little problem with that, the values of the
classfunction are just given as a list of values (one entry for every
conjugacy-class
Here is the essence of it.
sage: QQbar(e^(4/3*I*pi)*e^(2/3*I*pi).conjugate())
-0.500? + 0.866025403784439?*I
QQbar is not exactly a symbolic ring. In fact, in its documentation
we have
sage: QQbar.zeta(3)
-0.500? + 0.866025403784439?*I
I'm not quite sure how to fix
sage: version()
'Sage Version 4.4.3, Release Date: 2010-06-04'
sage: f=e^(i*x*pi-i*2*pi)
sage: f.simplify_full()
e^(I*pi*x)
# So far, so good
sage: n=var('n')
sage: f=e^(i*x*pi*n-i*2*pi*n)
sage: f.simplify_full()
e^(I*pi*n*x - 2*I*pi*n)
# Is there a way I can get this to simplify?
sage:
sage: n=var('n')
sage: f=e^(i*x*pi*n-i*2*pi*n)
sage: f.simplify_full()
e^(I*pi*n*x - 2*I*pi*n)
# Is there a way I can get this to simplify?
This apparently isn't even that easy in Maxima.
Maxima 5.21.1 http://maxima.sourceforge.net
using Lisp ECL 10.4.1
Distributed under the GNU Public
On Jun 22, 11:13 am, cjung cjun...@gmx.de wrote:
My question is now, if this is a bug or just a mistake in my code?
I suspect that you create your roots of unity using exponents that are
floats. In that case it may be a bug in Sage that it doesn't throw an
error. It may be what you are
On Jun 22, 2010, at 1:02 PM, Nils Bruin wrote:
On Jun 22, 11:13 am, cjung cjun...@gmx.de wrote:
My question is now, if this is a bug or just a mistake in my code?
I suspect that you create your roots of unity using exponents that
are floats.
If m and n are integers, m/n shouldn't be a
On Jun 22, 2:13 pm, cjung cjun...@gmx.de wrote:
Dear all,
Here's my problem: I've written a function (the scource code below),
which should compute the scalarproduct of two classfunction of a group
G. But there is a little problem with that, the values of the
classfunction are just given as a
On Tue, Jun 22, 2010 at 11:13 AM, cjung cjun...@gmx.de wrote:
0.?e-18 + 0.?e-19*I # - should be zero
I think that this is actually zero -- it just doesn't know it for sure
yet. For example, look at
sage: q = QQbar(sqrt(2))
sage: p = q^2; p
2.000?
sage: p == 2
True
sage: p
2
and
Hello Guys,
thank you for your suggestions.
s.simplify_full()
s.simplify_rational()
s.exactify()
All these solve the problem. I choosed s.exactify, because it seems to
be faster for big groups, so thanks all
best regards
--
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Forwarded from sage-edu.
-- Forwarded message --
From: Adam adammichaelwil...@gmail.com
Date: Tue, Jun 22, 2010 at 5:52 PM
Subject: [sage-edu] Installation on Fedora 13
To: sage-edu sage-...@googlegroups.com
I tried to install Sage from source on Fedora (Linux Fedora
On 06/22/10 11:56 PM, David Joyner wrote:
Forwarded from sage-edu.
-- Forwarded message --
From: Adamadammichaelwil...@gmail.com
Date: Tue, Jun 22, 2010 at 5:52 PM
Subject: [sage-edu] Installation on Fedora 13
To: sage-edusage-...@googlegroups.com
I tried to install Sage from
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