On 11 lis, 07:31, YarDYar wrote:
> Code:
> t = var('t')
> x = function('x',t)
> DE = diff(x, t) + x -1
> desolve(DE, [x,t])
> print x
> print DE
Hi, but you have different input than at
http://www.sagemath.org/doc/tutorial/tour_algebra.html#solving-differential-equations
Sou you get different
Robert Bradshaw wrote:
> On Nov 10, 2009, at 11:25 PM, Jonathan Bober wrote:
>
>> Does anyone know how to plot a matrix so that each pixel in the output
>> picture corresponds precisely to an entry in the matrix?
>>
>> To see the problem that I have, you might see the odd results that
>> occur
let's say I have
var('Re')
f = 0.25 / (log(5.74 / Re^0.9, 10))^2 / 4
I'd like to expand/evaluate all numerical constants and see dependency
on Re like
f = c1 / log(Re^c2)
how to reach this?
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On 11 lis, 11:16, zeliboba wrote:
> let's say I have
> var('Re')
> f = 0.25 / (log(5.74 / Re^0.9, 10))^2 / 4
> I'd like to expand/evaluate all numerical constants and see dependency
> on Re like
> f = c1 / log(Re^c2)
There is no chance to get answer like this from your input if c1 and
c2 are c
On 11 lis, 11:45, "ma...@mendelu.cz" wrote:
>
> I am thinking to add suppport for expansion of logarithms and perhaps
> evaluation this to Maxima, as well as improve support for rational
> expressions (not only fullratsimp but also ratsimp and xthru).
Oops, to Sage, not to Maxima, of course :)
Hi Robert,
On Wed, 11 Nov 2009 02:45:11 -0800 (PST)
"ma...@mendelu.cz" wrote:
> So my question for developers and experienced users os Sage is: Is
> there a function which converts input like f = 0.25 / (log(5.74 /
> Re^0.9, 10))^2 / 4 into 0.331368631905/log(5.74/Re^0.9)^2 in a similar
> way a
On Wednesday 11 November 2009, Christian wrote:
> Thankx for your quick response!!!
>
> I wish I could help, I'm weak in programming... specially in c++, but
> I'm trying to learn as fast as possible (~10 years according to Peter
> Norvig)...
> Anyway I will try a little bit.
Well, you don't nee
Marshall,
It 8 hours to do the initial install from the source. I would like to
evade this.
Mikie
On Nov 10, 2:54 pm, Marshall Hampton wrote:
> do:
>
> sage -upgrade
>
> from a shell and after downloading some information you will have to
> respond "Y" to whether you want to continue. If sage
Hi,
perhaps the following is helpful:
Quoting from the FAQs at http://wiki.sagemath.org/faq#Otherquestions :
QUESTION: I downloaded a Sage binary and it crashes on startup with
Illegal instruction. What can I do?
ANSWER: Short answer: One way to fix this is to build Sage entirely
from source. A
I can't get desolve_laplace to give me a good output. I had already
tried the regular solve (desolve) and it gave to told me that it
cannot solve that equation. This is my code:
sage: (g,t) = var('g,t')
sage: y=function('y',t)
sage: DEiii = pi * (39/100*y + 1/2)^2* diff(y,t) + a * sqrt(2*g*y)
> sage: desolve_laplace(DEiii, ["t","y"], [0,50,0])
> "?%ilt(-(1521*'laplace('y(t)^2*'diff('y(t),t,1),t,false)+3900*'laplace
> ('y(t)*'diff('y(t),t,1),t,false)+2500*sqrt(2)*'laplace(sqrt(g*'y
> (t)),t,false)-125000)/(2500*false),false,t)"
>
Looks like yet another Maxima expression we'll need to b
> We recently fixed code cell outputs
> to have horizontal scrollbars if needed. We could easily make text
> cells have horizontal scrollbars if needed by adding something like the
> following to the CSS:
>
> .text_cell {
> overflow-x:auto;
>
> }
Would this fix the problem that it shouldn't b
This is now #7431.
- kcrisman
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kcrisman writes:
> Of course, it would be worth seeing whether one of the other CASs can
> solve this one exactly.
possibly FriCAS can, it seems:
(2) -> DEiii := %pi * (39/100*y t+ 1/2)^2* D(y t,t) + a * sqrt(2*g*y t)
2 , +---+
On Wed, Nov 11, 2009 at 1:19 PM, Jaasiel Ornelas wrote:
>
> I can't get desolve_laplace to give me a good output. I had already
> tried the regular solve (desolve) and it gave to told me that it
> cannot solve that equation. This is my code:
>
> sage: (g,t) = var('g,t')
>
> sage: y=function('y',
I'm using:
Sage Version 4.1.1, Release Date: 2009-08-14
We just started laplace in my class, so I did not know that laplace
transforms don't solve non linear ode's. Sorry :p
On Nov 11, 12:01 pm, David Joyner wrote:
> On Wed, Nov 11, 2009 at 1:19 PM, Jaasiel Ornelas wrote:
>
> > I can't get de
On Wed, Nov 11, 2009 at 3:10 PM, Jaasiel Ornelas wrote:
>
> I'm using:
>
> Sage Version 4.1.1, Release Date: 2009-08-14
Okay. The above was done with Sage 4.2, so may or may not work in your version.
>
> We just started laplace in my class, so I did not know that laplace
> transforms don't so
Is there a way to label x-axis in terms of pi, say like pi/2, pi, 3pi/2?
Thanks,
-d
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As you pointed out, the equation has separated variables, so it must
work allmost in any version
Perhaps problems with keepfloat:true. Is you replace 0.5 by 1/2,
everything works.
See below
Robert
[ma...@um-bc107 /opt/sage]$ ./sage
---
Ok. I'm downloading 4.2 to see what happens, otherwise, I'll just do
it by hand.
On Nov 11, 12:13 pm, David Joyner wrote:
> On Wed, Nov 11, 2009 at 3:10 PM, Jaasiel Ornelas wrote:
>
> > I'm using:
>
> > Sage Version 4.1.1, Release Date: 2009-08-14
>
> Okay. The above was done with Sage 4.2, so
On 11 lis, 21:53, Jaasiel Ornelas wrote:
> Ok. I'm downloading 4.2 to see what happens, otherwise, I'll just do
> it by hand.
Dous not help, Sage 4.2 cannot solve your equation if you use 0.5 and
not 1/2
Change number 0.5 into 1/2 or use Maxima.
Robert
--~--~-~--~~~-
On 11 lis, 21:10, Jaasiel Ornelas wrote:
> I'm using:
>
> Sage Version 4.1.1, Release Date: 2009-08-14
>
> We just started laplace in my class, so I did not know that laplace
> transforms don't solve non linear ode's. Sorry :p
>
Are you student? If you put your equation (with a written as (1/2
You sir...
Are...
a genius.
On Nov 11, 12:13 pm, David Joyner wrote:
> On Wed, Nov 11, 2009 at 3:10 PM, Jaasiel Ornelas wrote:
>
> > I'm using:
>
> > Sage Version 4.1.1, Release Date: 2009-08-14
>
> Okay. The above was done with Sage 4.2, so may or may not work in your
> version.
>
>
>
> > W
Hi,
Thanks William for the reply.
> There's a 32-bit debian binary here:
>
> http://sage.math.washington.edu/home/wstein/binaries/old-4.2/
I've downloaded a binary from UTK (for my 32-bit laptop) compiled for
Debian Lenny. At start it says version 4.1.2... I don't know if it
is just the disp
kcrisman wrote:
>> We recently fixed code cell outputs
>> to have horizontal scrollbars if needed. We could easily make text
>> cells have horizontal scrollbars if needed by adding something like the
>> following to the CSS:
>>
>> .text_cell {
>>overflow-x:auto;
>>
>> }
>
> Would this fix t
Dear SAGE developers,
I too had a few errors building SAGE from source in
Ubuntu 9.10. I do seem to have a working installation
now, so maybe the errors are harmless. I've posted my
install.log file here:
http://gmarks.co.cc/install.log
(with some slight editing done for security reasons;
i
Dear sage-support
When changing the code, running ./sage -b and testing the things in
notebook in Firefox I tried to keep ./sage -notebok running, I changed
some code in another window and compiled with ./sage -b. Switching
back to notebook, something hang and notebook did not work as
expected. S
On Wed, Nov 11, 2009 at 2:19 PM, ma...@mendelu.cz wrote:
>
> Dear sage-support
>
> When changing the code, running ./sage -b and testing the things in
> notebook in Firefox I tried to keep ./sage -notebok running, I changed
> some code in another window and compiled with ./sage -b. Switching
> ba
Dan Aldrich wrote:
> Is there a way to label x-axis in terms of pi, say like pi/2, pi, 3pi/2?
>
I don't think there is a nice, easy, builtin way. Yet.
I see two elegant solutions (now talking with people who are or want to
be familiar with the matplotlib code that goes on behind the scenes):
> > Would this fix the problem that it shouldn't be overflowing in the
> > first place (look at this specific example, where the formula should
> > just be going to the next line), or is that a jsmath issue?
>
> Jsmath doesn't wrap across a linebreak, so yes, I think that's a jsmath
> issue.
Sor
> 1. Make show also take in an x coordinate length, plus a formatting
> function. Then use a MultipleLocator matplotlib locator and a formatter
> to get the axes ticks.
>
> 2. Make show take a matplotlib formatter and matplotlib locator. Then a
> user could construct their own formatters/locator
>
> No. Just click "Action --> Restart worksheet" (possibly twice) and
> you'll get the new version of Sage. There is no need to ever restart
> the notebook server unless you're doing development on the notebook
> server itself.
Works fine, thanks
Robert
>
> -- william
--~--~-~--~
kcrisman wrote:
>> 1. Make show also take in an x coordinate length, plus a formatting
>> function. Then use a MultipleLocator matplotlib locator and a formatter
>> to get the axes ticks.
>>
>> 2. Make show take a matplotlib formatter and matplotlib locator. Then a
>> user could construct their
> Well, you don't need to master C++, for wrapping a C++ library we use Cython
> which is a much smaller and easier language. Have a look at
> http://www.cython.org
> Note that Burcin worked on wrapping FFLAS-FFPACK
> directly before (I am pinging him explicitly, so he knows about this threat)
O
Hi,
I have a problem starting a sage server after, I think, upgrading to
Ubuntu 9.10 server edition. It just hangs at the point "Generating a
2048 bit RSA private key..." See the following transcript:
s...@ubuntu:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:
On Wed, Nov 11, 2009 at 6:22 PM, Kwankyu wrote:
>
> Hi,
>
> I have a problem starting a sage server after, I think, upgrading to
> Ubuntu 9.10 server edition. It just hangs at the point "Generating a
> 2048 bit RSA private key..." See the following transcript:
>
> s...@ubuntu:~$ lsb_release -a
>
William Stein a écrit :
> On Wed, Nov 11, 2009 at 6:22 PM, Kwankyu wrote:
>> Hi,
>>
>> I have a problem starting a sage server after, I think, upgrading to
>> Ubuntu 9.10 server edition. It just hangs at the point "Generating a
>> 2048 bit RSA private key..." See the following transcript:
>>
>>
>
Hello !!!
I have a pretty easy simplification problem When I have a looong
fraction, something like :
1 / ( 1 - 1/ ( 1- 1/ a ))
How can I ask sage to rewrite i as rational value ?
I would like something like : 1 / ( 1 - 1/a ) to give me a / (a-1), and a
similar behaviour for longer fraction
Thierry Dumont wrote:
> William Stein a écrit :
>> On Wed, Nov 11, 2009 at 6:22 PM, Kwankyu wrote:
>>> Hi,
>>>
>>> I have a problem starting a sage server after, I think, upgrading to
>>> Ubuntu 9.10 server edition. It just hangs at the point "Generating a
>>> 2048 bit RSA private key..." See the
Hello,
On Thu, Nov 12, 2009 at 2:40 PM, Nathann Cohen wrote:
> Hello !!!
>
> I have a pretty easy simplification problem When I have a looong
> fraction, something like :
>
> 1 / ( 1 - 1/ ( 1- 1/ a ))
>
> How can I ask sage to rewrite i as rational value ?
sage: a = var('a')
sage: f = 1 / (
Hi,
Perhaps I didn't wait for long enough time. :-) I pushed ctl-c in
frustration.
Anyway if I directly input the exactly same certool command on the
command line on the same machine, it immediately returned. This is
curious...
Kwankyu
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