Dear all,
I had a lecture in computer lab. There were about 15 students on one
sage server. After about 20 minutes we got messages, that Sage lost
connection to Maxima. I did not know how to establish the connection
again and I restarted the virtual server (I run sage on virtual server
under
Many thanks, memory seems to be a big problem on my server (I did
tests you suggested on my laptop and each worksheet is consumig a lot
of memory). I have seen that sagenb.org has 2GB memory - like my PC.
How many users wirk simultaneously on sagenb.org?
* I think that I can set up my personal
Thank you for all your answers. I will upgrade my hardware
512MB is very very piddly for a server.
Yes. I thought that this could be enough, because another my server,
Mathematical Assistant on Web (
http://user.mendelu.cz/marik/maw/index.php?lang=enform=derivace
) runs pretty well with
In the text The calculators are divided into several groups, the
desription is available, the word description is missing the c.
Fixed, thanks. Robert
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Hello all
The command latex(7-(-1)^(1/3)) produces 7 - {-1}^{\frac{1}{3}}
Is it possible to change it into 7 - \left(-1\right)^{\frac{1}{3}}
Which function should be redefined to gain this behavior?
I think that two minus sign, one following the other, could be
confusing (for students of
On 14 Led, 08:50, mabshoff michael.absh...@mathematik.uni-
dortmund.de wrote:
Your server calls Maxima and without taking a closer look it is
unclear to me if you start a Maxima process per user or not. Overall
Maxima is lighter than Sage primarily because it is all common lisp
and does
Hello all
Maxima is much better when drawing 2D plots of functions with jump
discontinuity.
Sage makes a vertical lines at disontinuities, compare
A=plot(1/(x^2-1),(x,-3,3))
show(A,ymax=10,ymin=-10)
in sage and
plot2d(1/(x^2-1),[x,-3,3],[y,-10,10])
in Maxima. Is it possible to remove these
Hello, I installed today new sage with jsmath bitmap font. These fonts
did not work, I had to put the bitmap fonts from old installation to /
opt/sage-3.4-linux-Debian_GNU_Linux_5.0_lenny-i686-Linux/data/extcode/
javascript/jsmath manually.
From this reason I report this problem (maybe a bug).
On 17 Bře, 00:41, Jason Grout jason-s...@creativetrax.com wrote:
ma...@mendelu.cz wrote:
Robert, for now, you can
installhttp://sage.math.washington.edu/home/mabshoff/spkgs/jsmath-image-font...
into sage 3.4 and it should work. The javascript code was recently
reorganized, so
On 18 Bře, 20:23, adrian nihilalienumcr...@gmail.com wrote:
If i try to do
plot(cos(x),(x,-3,3))
This command works in Internet version www.sagenb.org
The same for sphere()
Maybe something hangs from previous computation? Did the restart of
worksheet not help?
Robert
in sage 3.4 (through
Hello, the same is with Czech. Seems to be related to
http://groups.google.cz/group/sage-support/browse_thread/thread/60a863def66c05a1/ca1626cc03a29bfa?lnk=gstq=accent#ca1626cc03a29bfa
and reported on http://trac.sagemath.org/sage_trac/ticket/4956
Robert
On 19 Bře, 08:27, Dan Drake
On 19 Bře, 07:00, Kwankyu ekwan...@gmail.com wrote:
Hi,
If I write in Korean and save in the TinyMCE editor in the Sage
Notebook, it appears fine. But if I open the cell to change the
content, then the Korean characters are all gone and strange
characters are shown instead. Perhaps an
Hello, this command produces one half of a cirle, not 1/4 as excepted.
I think that this is a bug in sage 3.4
Robert
region_plot([y0,x0,x^2+y^23], (-3, 3), (-3,
3),plot_points=100,incol='gray').show(aspect_ratio=1)
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Hello, I used the commands
hg_sage.import_patch(http://trac.sagemath.org/sage_trac/raw-
attachment/ticket/4547/trac_4547.patch)
hg_sage.import_patch(http://trac.sagemath.org/sage_trac/raw-
attachment/ticket/5211/trac_5211.patch)
hg_sage.import_patch(http://trac.sagemath.org/sage_trac/raw-
On 19 Bře, 16:55, ma...@mendelu.cz ma...@mendelu.cz wrote:
Hello, I used the commands
hg_sage.import_patch(http://trac.sagemath.org/sage_trac/raw-
attachment/ticket/4547/trac_4547.patch)
hg_sage.import_patch(http://trac.sagemath.org/sage_trac/raw-
attachment/ticket/5211/trac_5211.patch
On 19 Bře, 16:47, Jason Grout jason-s...@creativetrax.com wrote:
ma...@mendelu.cz wrote:
Hello, this command produces one half of a cirle, not 1/4 as excepted.
I think that this is a bug in sage 3.4
Robert
region_plot([y0,x0,x^2+y^23], (-3, 3), (-3,
3),plot_points=100,incol='gray
This works:
sage: var('x,y')
sage: region_plot([y0,x0,x^2+y^23], (x, -3, 3), (y, -3,3))
But if one leaves out the variables, one gets an half circle:
sage: region_plot([y0,x0,x^2+y^23], (-3, 3), (-3,3))
I've written a patch which fixes
Do you mean something like bool(x^6-1)
Or you can use maxima inside sage and the command is
http://maxima.sourceforge.net/docs/manual/en/maxima_5.html#Item_003a-is
I think that in general you can expect poor results in any computer
algebra system (like you write about Maple).
Robert
On
On 20 Bře, 13:53, kcrisman kcris...@gmail.com wrote:
something like this, because there are too many similar things to
catch. I also believe Maple does not plot the negative values.
You are right, Maple plots x^(1/3) only for positive x. As a side
effect, if you try to plot the function
Hello all, after installing these patches I observed the folloving
behavior:
If I enter $x$ in tinymce, save and then enter again, I see the
picture for x and not $x$.
When I save again, $x$ is replaced by sentence like
span class=typesetspan class=scaleimg style=width: 16px;
vertical-align:
On 21 Bře, 07:05, Craig Citro craigci...@gmail.com wrote:
That works well, but what about when the expression is multivariate,
such as:
expand((1+x+1/y)^10)
It would be nice to have a general command to count the number of
summands in such an expression.
Yep, I agree. Here is a
Hello, this is related to the thread at
http://groups.google.cz/group/sage-support/browse_thread/thread/2a699360a3847bab
I think that installation of
http://trac.sagemath.org/sage_trac/attachment/ticket/5564/trac_5564-2.patch
causes that TinyMCE cannot be used to edit mathematical formulas
If I
On 22 Bře, 04:46, Jason Grout jason-s...@creativetrax.com wrote:
As a hint to whoever wants to hunt this down if they get to it before
me: the original text of the cell is stored in a parameter passed to
tinymce when tinymce is initialized. This is passed in the data
attribute in the
On 11 Dub, 02:26, mabshoff michael.absh...@mathematik.uni-
dortmund.de wrote:
On Apr 10, 5:21 pm, kcrisman kcris...@gmail.com wrote:
If I remember correctly Derive had such a step by step mode for
various things like limits, integration and so on. Derive itself was
killed as a product, so
Hi, great idea, but remember that computer algebra systems use
slightly different way than humans to solve problems...
I think than more people work on something like this -- just guessing
from questions like
http://thread.gmane.org/gmane.comp.mathematics.maxima.general/23048/focus=23051
and
Hi, I think that it is insecure to run sage on a server which is used
for other tasks (webserver, mail server, ).
At least run sage not under your or root account, otherwise you give
to the sage users all your privileges.
Better idea is to have one computer for Sage and nothing more. As
On 20 Dub, 08:17, Florian Beutler florian.beut...@gmx.de wrote:
if I use
rho = 0.0058/((r/2.4)*(1+(r/2.4))^2)
integral(rho,r,0,10)
btw: your integral is divergent (behaves like 1/r near zero).
R.
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Hi, try this
r=var('r')
rho = 0.0058/((r/2.4)*(1+(r/2.4))^2)
integral(rho,r,0.01,10).n()
Robert Marik
On 20 Dub, 08:17, Florian Beutler florian.beut...@gmx.de wrote:
hallo
I just installed sage today and probably the problem I have at the
moment is a typical beginner problem, but
On Apr 21, 8:34 pm, kcrisman kcris...@gmail.com wrote:
On Apr 19, 12:42 pm, ma...@mendelu.cz ma...@mendelu.cz wrote:
Hell, I think that my question is related
tohttp://groups.google.cz/group/sage-support/browse_thread/thread/7cb33...
How can I write a function which takes determinant
On 23 Dub, 20:38, William Stein wst...@gmail.com wrote:
On Thu, Apr 23, 2009 at 6:44 AM, philabuster pollock.p...@gmail.com wrote:
Hi,
I was wondering why Sage expands products of sums in an unexpected
order:
var('a0,a1,b0,b1,b2,c0,c1,c2,c3,d0,d1,d2,d3,d4')
The ordering of these
Dear SAGE experts,
from the output of desolve?? command I understand that desolve call
maxima and ode2 to solve ordinary differential equations.
1. How can I get the access to method variable?
commands
maxima(ode2('diff(y,x)=x^6*cos(y),y,x))
maxima('method')
give the answer separable, but
On 28 Dub, 15:42, ma...@mendelu.cz ma...@mendelu.cz wrote:
Dear SAGE experts,
forgot to write: the test notebook for these issues is at
http://www.sagenb.org/home/pub/494/
Robert
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Dear memebers of SAGE-support
I wonder if it is possible to substitute initial conditions into an
equation produced by desolve. I tried something like
y=function('y',x)
desolve(diff(y,x)+sin(x)*y^6==0,y)
sol({x:pi,y:9})
and got
1/(5*y(pi)^5) == c + 1
but I would like to see
1/(5*9^5) == c
substitutions.
Anyway, I get this:
sage: y=function('y',x)
sage: desolve(diff(y,x)+sin(x)*y^6==0,y)
1/(5*y(x)^5) == c - cos(x)
sage: desolve(diff(y,x)+sin(x)*y^6==0,y,[pi,9])
1/(5*y(x)^5) == (-295245*cos(x) - 295244)/295245
Does that help?
On Tue, Apr 28, 2009 at 10:36 AM, ma...@mendelu.cz
understand.
On Tue, Apr 28, 2009 at 1:59 PM, ma...@mendelu.cz ma...@mendelu.cz wrote:
Hello, I just want to test, if I can do with my students in computer
lab what they usualy do on the paper
1. find general solution
2. substitute from initail conditions
3. find c
4. use this c in general
On 4 Kvě, 11:29, mabshoff michael.absh...@mathematik.uni-dortmund.de
wrote:
I would suggest you complain in the Maxima group to have them take a
stake into packaging current Maxima releases for Debian/Ubuntu. AFAIK
the Maxima maintainer for Debian isn't exactly underworked, so I am
sure
Hi
On 4 Kvě, 11:56, mabshoff michael.absh...@mathematik.uni-dortmund.de
wrote:
Hello, not related to Sage, but if I remember correctly, newer Maxima
is in Debian Sid (compiled with GCL). This Sid version is slower than
5.13 (with GCL also).
Do you have any idea why that is and how much
Hello, this code give double exponent error.
var('a x b gamma p')
f(x)=a*x^((gamma-p))+b*x^((-p))
(f((b*p/((gamma-p)*a))^(1/gamma))).show()
Is it error in sage to TeX converter?
Tested today on sagenb.org
Thanks
Robert Marik
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To post to this
Hello all, thank you for such a wonderfull software like Sage. I
appretitate the support for nonenglish languages in commnets has been
added some moths ago. However, I returned to Sage after several moths
without any CAS and observed, that if I use letters like ěščř in
TinyMCE editor, save and
Dear users of Sage, sorry to bother again, with checked Typeset button
the command
solve(x==sqrt(99),x)
gives x==3*sqrt(11)
However sqrt(99) gives 3\,\sqrt{11}. I think that this second format
should be used also in the first case and I am almost sure that it was
in some previoous versions of
Hello all,
I am trying to provide Sage server for my students. If I run Sage in
vmware, I can access the vmware virtual machine from my PC only. The
students can connect to my PC, but not to the virtual machine. I
guess, some port forwarding and NAT setup i snecessary.
I searched on
Hello all,
I am trying to provide Sage server for my students. If I run Sage in
vmware, I can access the vmware virtual machine from my PC only. The
students can connect to my PC, but not to the virtual machine. I
guess, some port forwarding and NAT setup i snecessary.
I searched on
On 24 zář, 09:17, Robert Bradshaw rober...@math.washington.edu
wrote:
This depends on what kind of PC you're running the server on. The way
we do sagenb.org is have apache running on the host machine which
forwards all incoming connections to the virtual machine with re-
writing rules. This
On 24 zář, 09:29, Jason Grout jason-s...@creativetrax.com wrote:
In addition to Robert Bradshaw's answer, you could also set up bridged
networking in VMWare for this sort of thing.
Thanks, but the network policy on our university allows to have only
one (given and registered) MAC address
On 24 zář, 20:23, Iskay matis...@gmail.com wrote:
I wanted to plot x^(1/3) in sage. When I typed it on sage it returned
this.
f = x^(1/3)
plot(f)
verbose 0 (2999: plot.py, generate_plot_points) WARNING: When
plotting, failed to evaluate function at 100 points.
verbose 0 (2999: plot.py,
On 25 zář, 04:27, Sterling sterlin...@gmail.com wrote:
How do I evaluate a Jacobian at certain values? For example, I type:
x1,x2,x3 = var('x1 x2 x3')
f1(x1,x2,x3) = 3*x1 - cos(x2*x3) - (1/2)
f2(x1,x2,x3) = x1^2 - 81*(x2 + 0.1)^2 + sin(x3) + 1.06
f3(x1,x2,x3) = e^(-x1*x2) + 20*x3 +
On 25 zář, 05:29, ma...@mendelu.cz ma...@mendelu.cz wrote:
On 25 zář, 04:27, Sterling sterlin...@gmail.com wrote:
How do I evaluate a Jacobian at certain values? For example, I type:
x1,x2,x3 = var('x1 x2 x3')
f1(x1,x2,x3) = 3*x1 - cos(x2*x3) - (1/2)
f2(x1,x2,x3) = x1^2 - 81*(x2
On 24 zář, 11:08, William Stein wst...@gmail.com wrote:
For the record, here is the actual entry I use in /etc/httpd.conf:
VirtualHost *
RewriteEngine On
ServerName sagenb.org
ProxyPass/http://sagenb2:8000/
ProxyPassReverse /http://sagenb2:8000/
DocumentRoot /
Hello all, I established Sage server for our university (running in
vmware, behind firewall, thanks for help from this group concerning
port forwarding etc.) and now I have two more questions.
1. I start Sage in rc.local by
nohup su sage -c 'cd /opt/sage./sage notebook.sage' /dev/null
How
On 26 zář, 15:27, Thierry Dumont tdum...@math.univ-lyon1.fr wrote:
... strange only for me I hope.
I have similar problem. As I undesrstand, if the user sage runs
program sage and user sageuser is in server_pool, then .sage directory
should be writeable for sage, but not for sageuser. Right?
Dear sage users, I'm trying this piece of code (
http://alpha.sagenb.org/home/pub/16
)
x,y = var('x y')
(x_min, x_max, y_min,y_max)=(0,2,0,4)
f(x,y)=cos(y)
A=plot_slope_field(f(x,y),(x, x_min, x_max), (y, y_min,y_max))+text
(('$y\,^{\prime}=%s $'%latex(f(x,y))),(x_max,y_max),
Hello all, I am looking for the possibility how to simplify each term
in an expression separately.
Consider
A=x/((x^2/y^2 + 1)*y) + arctan(x/y)
I wish to get x*y/(x^2+y^2)+atan(x/y) , which can be produced in
Maxima by map(fullratsimp, A)
* simplify(A) gives A - no simplification
*
On 30 zář, 22:17, ma...@mendelu.cz ma...@mendelu.cz wrote:
Hello all, I am looking for the possibility how to simplify each term
in an expression separately.
Consider
A=x/((x^2/y^2 + 1)*y) + arctan(x/y)
I wish to get x*y/(x^2+y^2)+atan(x/y) , which can be produced in
Maxima by map
On 1 říj, 15:27, kcrisman kcris...@gmail.com wrote:
Hope this helps,
Yes, it helped. Thank you.
Robert Marik
- kcrisman
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On 3 říj, 08:37, William Stein wst...@gmail.com wrote:
On Fri, Oct 2, 2009 at 10:34 PM, Mike Hansen mhan...@gmail.com wrote:
Hello,
On Sat, Oct 3, 2009 at 12:17 PM, Chris Seberino cseber...@gmail.com wrote:
The wonderful Sage notebook uses relative urls like
/login and /register. How
Dear sage users and developers
trying to solve y''+4y=0 with initial conditions y(0)=0 and y'(0)=0
y=function('y',x)
eq=diff(y,x,2)+4*y==0
desolve(eq,y,ics=[0,0,0])
sage returns y(0)*cos(2*x) and not 0
What is wrong? The help for the desolve command shows the same
behavior on slighhtly
I do not understand french error messages, but what about
http://localhost:8000
and
http://127.0.0.1:8000
Is the sage notebook there?
btw: the french messages are probably not from sage
Robert Marik
On 3 říj, 12:40, Michel Barthélémy Billard Sirakawa
bi...@ouvaton.org wrote:
PC emachine
:
This is a known bug. Marshall and I tried to fix it during a SageDays in
Seattle but failed to figure out the magic in Robert Bradshaw's code
for desolve. I think it is easy to fix for those who know how to fix it
easily, but that rules me out:-)
On Sat, Oct 3, 2009 at 3:30 AM, ma...@mendelu.cz ma
in Robert Bradshaw's code
for desolve. I think it is easy to fix for those who know how to fix it
easily, but that rules me out:-)
On Sat, Oct 3, 2009 at 3:30 AM, ma...@mendelu.cz ma...@mendelu.cz wrote:
Dear sage users and developers
trying to solve y''+4y=0 with initial conditions y
On 3 říj, 23:22, ma...@mendelu.cz ma...@mendelu.cz wrote:
I have not enought skill in Python, Sage, hg and related thinks. Is
there any person interested in the problem, which sould like to try
this?
The following code works in Sage
y=function('y',x)
k1,k2=var('k1 k2')
x0,y0,y1=0,1,2
about Python or Mercurial either. If you don't have a Trac account,
email William privately for one, and then you can log this as a ticket
and create a patch. In the meantime the documentation for doing very
basic patches is pretty good in the developer's guide, which I think
is linked on
On 4 říj, 14:57, Marshall Hampton hampto...@gmail.com wrote:
For the first time dealing with some of these things the IRC channel
sage-devel is very helpful. It would be great if you could do this.
I am happy to review it, you can put me as a CC: or reviewer. I think
your solution sounds
I have one solution :) very very poor (really very poor) solution
and from this reason I will not supply the patch yet.
The method is to call ode2 again, now together with ic2 in one new
call of Maxima.
The (fixed) file is desolvers.py is at
http://user.mendelu.cz/marik/temp/desolvers.py
On 5 říj, 23:14, calcp...@aol.com wrote:
Wow, this sounds like a big bug. I will be using Sage quite a bit in a
Calculus I and II lab in the Spring. Is this going to be huge problem?
Do not think that this will be huge problem. You cal allwayas use
Maxima instead Sage. In notebook you can
conditions and I do not know how can I find revision
number from the output of hg_sage.log() which looks like this.
changeset: 12847:506e71164e58
tag: tip
user:Robert Marik ma...@mendelu.cz
date:Tue Oct 06 11:36:32 2009 +0200
summary: fix for initial conditions
On 6 říj, 15:21, kcrisman kcris...@gmail.com wrote:
ere.
Thanks for taking the time to look into this!
Thank you for your help. I posted the patch
http://trac.sagemath.org/sage_trac/ticket/6479
which (I hope) fixes ic2 and bc2 commands.
Results of tests have been updated and test related to
Hm, this is my Sage 4.1.1
a1=-(sqrt(13)-1)/2
latex(a1)
output is -\frac{1}{2} \, \sqrt{13} + \frac{1}{2}
You may have old version of Sage
latex(-{{\sqrt[13]-1\over[2}}) produces error
Robert Marik
On 6 říj, 21:10, Mikie thephantom6...@hotmail.com wrote:
If I have this a1=-(sqrt(13)-1)/2 in
me the
\over. I am using 3.4.
When I assign it to a variable it works as below. If you would try
a1=maxima.solve(x^2-x-3,x)
R1=a1[0]
R3=maxima.rhs[R1]
latex(R3)
produces -- {{1-\sqrt{13}}\over{2}}
not good
On Oct 6, 1:46 pm, ma...@mendelu.cz ma...@mendelu.cz wrote:
Hm, this is my
This is very very small RAM for 7 sage notebooks
I think that this has been dicussed here or in sage-edu in January
Robert Marik
On 7 říj, 01:00, Chris Seberino cseber...@gmail.com wrote:
I have an Ubuntu 9.04 Xen virtual machine with 350 Mb RAM.
(from linode.com hosting services)
I tried
On 7 říj, 01:19, ma...@mendelu.cz ma...@mendelu.cz wrote:
This is very very small RAM for 7 sage notebooks
I think that this has been dicussed here or in sage-edu in January
Btw. where are posts from January? They seem to be deleted from this
group. Are they deleted? Or is there something
On 7 říj, 13:36, William Stein wst...@gmail.com wrote:
http://groups.google.com/group/sage-edu/topics?start=80sa=N
Sorry for missunderstanding, I mean sage-support, seems to start in
October
http://groups.google.com/group/sage-support/topics?start=1
Robert
On 7 říj, 13:42, William Stein wst...@gmail.com wrote:
On Wed, Oct 7, 2009 at 4:40 AM, ma...@mendelu.cz ma...@mendelu.cz wrote:
It's October right _now_. The archive doesn't start in October, it ends in
October.
Oops, sorry :)
So another threat related to memory and Sage in education
On 7 říj, 16:21, Ranjit rjcha...@gmail.com wrote:
I'm trying to figure out how to do a simple substitution. I've the
following code:
var('r beta beta_0 R a h')
psi=function('psi',r)
sigma=function('sigma',r)
H_0=function('H_0',r)
H_grad = lambda psi :
* Use plot3d
* typo error mp2 versus m2 and mp1 versus m1 ?
This works.
var('t1 t2')
m1 = 0.33;
m2 = 0.39;
sap = 1.2;
saf = 0.4;
H = 10;
E(t1,t2)= -1*m1*H*sin(t1) - m2* H * sin(t2)+sap * cos(t2-t1)-saf * sin
(t1)
plot3d(E,(t1,-5,5),(t2,-5,5))
R.M.
On 7 říj, 23:09, SG
perhaps, no subst is necessary:
var('r beta beta_0 R a h')
psi=function('psi',r)
sigma=function('sigma',r)
H_0=function('H_0',r)
H_grad = lambda psi : (1/2)*(beta/beta_0)*R^2*(psi.diff(r))^2
H_0(psi) = -(1/2)*(beta/beta_0-1)*psi^2 + beta*a*psi^4 + beta*h*psi
On 8 říj, 19:41, Ranjit rjcha...@gmail.com wrote:
does not. So I guess there's an upper limit to the number of
operations that the expression being replaced can have to work in subs
().
Perhaps true, but IMHO very risky guess which is not true, if pattern
matching in Maxima is behind the
Perhaps somebody knows how is this supported in Sage.
I know only how to get the answer via maxima and
http://maxima.sourceforge.net/docs/manual/en/maxima_20.html#Item_003a-Introduction-to-QUADPACK
sage: expr=sin(x)/x
sage: ex=expr._maxima_()
sage: print ex.quad_qags(x,1,2,).sage()
sage:
numerical_integral?
On 12 říj, 13:01, ma...@mendelu.cz ma...@mendelu.cz wrote:
Perhaps somebody knows how is this supported in Sage.
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(3*x + m*x + a*y+b*y ).collect(x).collect(y)
On 12 říj, 19:20, Chris Seberino cseber...@gmail.com wrote:
How group terms in an expression?
e.g. How group terms with x and y in:
3*x + m*x + a*y+b*y
to get:
(3 + m)*x + (a + b)*y ??
cs
no error with 4.1.2.rc0
R.M.
[ma...@um-bc201 /opt/sage-4.1.2.rc0]$ ./sage
--
| Sage Version 4.1.2.rc0, Release Date: 2009-09-30 |
| Type notebook() for the GUI, and license() for information.|
Hello all, is there any other possibility how to plot implicit
function than implicitplot?
I do not like implicitplot too much, since it is in fact countourplot
and it is not easy to set the color (for example).
Thanks
Robert Marik
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On 14 říj, 05:51, Jason Grout jason-s...@creativetrax.com wrote:
implicit_plot(x^2+y^2==1, (x,-2, 2), (y,-2, 2), cmap=[red])
Thanks, I missed this example.
I tried rgbcolor and color option and then tried blindly various
predefined colormaps.
Robert Marik
On 14 říj, 06:20, Jason Grout jason-s...@creativetrax.com wrote:
Chris Seberino wrote:
How make worksheet run some code at startup?
e.g. var(a b c d ... z) ?
Currently my students need to evaluate var(a b c ... z) in every
worksheet I give them. It would be nice to hardcode this
Hello all
trying approximate numerically eigenvalues of a matrix I get Error
sage: A=matrix(((0,1),(-1,0)))
sage: B=A.eigenvalues()[0]
sage: n(B)
Traceback (click to the left for traceback)
...
ValueError: Cannot coerce algebraic number with non-zero imaginary
part
to algebraic real
I guess,
On 16 říj, 05:45, William Stein wst...@gmail.com wrote:
On Thu, Oct 15, 2009 at 7:45 PM, Matt Rissler discn...@gmail.com wrote:
Basically, I'm having student look for the x that makes the matrix
singular, or the columns linearly dependent, or ... However Sage
behaves like so:
sage:
I think that you can use custom css file in your .sage directory.
I do not remember he name of this file, try to seach this group, it
has been dicussed - here or in sage-devel
Robert Marik
On 16 říj, 00:21, Chris Seberino cseber...@gmail.com wrote:
On Oct 15, 2:21 pm, William Stein
On 16 říj, 06:28, Mike Hansen mhan...@gmail.com wrote:
How do _you_ detect when the session is over? Your code needs to be
responsible for detecting when the session is over and deleting the
PNGs.
You can also use sufficiently random and long names in temp directory
and in cron daemon
On 16 říj, 21:32, Laurent moky.m...@gmail.com wrote:
a = 1
b = 2
c = 3
d = 8
print \\frac{,a,-,b,}{,c,-,d,}=,(a-b)/(c-d)
perhaps print \\frac{,a,-(,b,)}{,c,-,d,}=,(a-b)/(c-d) if
b0
Robert
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On 17 říj, 23:06, Laurent moky.m...@gmail.com wrote:
My aim is to do
solve(g(x)=0.5)
for example.
Any ideas ?
I have no idea how to solve your question, but even if you solve it,
the command solve will not work in this kind of problem. You should
use some command which solves
Probably depends not on Sage but on your OS. Customize file
associtations in your file manager. Or what aoubt to save picture in
native format and use convertcommand to convert into gif or anything
else.
Robert
On 23 říj, 12:34, wxu...@sohu.com wrote:
Hi all,
when I use sage.4.0.2 to plot a
On 30 říj, 14:32, Flavio Coelho fccoe...@gmail.com wrote:
On Oct 30, 12:35 pm, ma...@mendelu.cz ma...@mendelu.cz wrote:
Where do you have this problem? In text cell produced by TinyMCE? If
so, then it has nothing to do with your LaTeX installation - this is
formated by jsmath.
Do you
On 30 říj, 13:30, Flavio Coelho fccoe...@gmail.com wrote:
I forgot to mention my platform:
Ubuntu Karmic Koala,
Firefox 3.5.3
From: http://www.math.union.edu/~dpvc/jsMath/changes.html
The linux version of Firefox 3.5 doesn't seem to be able to read the
jsMath TeX fonts (probably due to
You have to publish it, not share!
Robert
On 31 říj, 21:24, calcp...@aol.com wrote:
When you are happy with a worksheet, how do you publish it? Do you simply
click in the notebook() where it says share? I did so, but I do not see
my worksheet in the published page. Does it take a while
Hello all, two download links from main page at sagemath.org point not
to download page, but to download binary for windows. I think that
this is not intended.
Despite the fact that sage runs on Linux, it is more complicated to
find Linux version than windows
Robert
On 31 říj, 23:09, William Stein wst...@gmail.com wrote:
On Sat, Oct 31, 2009 at 2:56 PM, calcp...@aol.com wrote:
OK, what does sharing mean then? And how do I publish a worksheet
instead?
I think that sharing means, that another user can run and modify your
worksheet.
R.
On 1 lis, 13:49, Wilfried_Huss h...@finanz.math.tugraz.at wrote:
On 29 Okt., 12:44, ma...@mendelu.cz ma...@mendelu.cz wrote:
Hello all, the conversion into PDF has been discussed several times
here.
One option is to print into a PDF file. This is another possibility:
I wrote
On 1 lis, 15:08, ma...@mendelu.cz ma...@mendelu.cz wrote:
I have two another improvements (and changed the script at
http://user.mendelu.cz/marik/sage/sage2tex)
btw: another improvement in current http://user.mendelu.cz/marik/sage/sage2tex
(from October 30) are lines
lines 46-48
The Maxima version which is present in Sage fails for this problem, se
the session below.
Which version of Maxima do you use on your computer? In Sage there is
version 5.19.1. Does your computation work in this version of Maxima?
Robert
Hello Bryan
If you are interested in this, compile CVS version of Maxima and look,
if the CVS version has the same problem. If yes, report the problem at
http://sourceforge.net/tracker/?group_id=4933atid=104933
I did similar work for inequality solver few week ago and this issue
has been fixed
*z-7469))
Robert.
On 4 lis, 07:51, ma...@mendelu.cz ma...@mendelu.cz wrote:
Hello Bryan
If you are interested in this, compile CVS version of Maxima and look,
if the CVS version has the same problem. If yes, report the problem
athttp://sourceforge.net/tracker/?group_id=4933atid=104933
I did
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