On Dec 3, 2008, at 1:03 AM, Craig Citro wrote:
Thanks. That works, but Sage automatically expands things so you
need to do,
[(i^j).factor() for i,j in f]
To ensure that each polynomial term is shown factorized.
Do you want a list of pairs of the form (p,e) for each term in the
factorizati
> Thanks. That works, but Sage automatically expands things so you
> need to do,
> [(i^j).factor() for i,j in f]
>
> To ensure that each polynomial term is shown factorized.
>
Do you want a list of pairs of the form (p,e) for each term in the
factorization of f? (That's actually how the factoriza
On Dec 3, 2008, at 12:18 AM, Jason Grout wrote:
An easier way:
sage: f=factor(16200)
sage: f
2^3 * 3^4 * 5^2
sage: [i^j for i,j in f]
[8, 81, 25]
Thanks. That works, but Sage automatically expands things so you
need to do,
[(i^j).factor() for i,j in f]
To ensure that each polynomial term
Tim Lahey wrote:
> Hi,
>
> Does the Factorization class not have a
> routine to return just a list of the factors?
> Basically, something like the value function
> but instead of multiplying them, puts
> each term into a list?
>
> I ask because the output of a squarefree_decomposition
> is a fac
Tim Lahey wrote:
> Hi,
>
> Thanks. I was kind of hoping for something less drastic,
> but that works. In Maple there is just a variable you can
> set which controls things, so you can do it on a per script
> basis.
>
This is something that has come up before too. I think it might make
sense
Hi,
Does the Factorization class not have a
routine to return just a list of the factors?
Basically, something like the value function
but instead of multiplying them, puts
each term into a list?
I ask because the output of a squarefree_decomposition
is a factorization and I'd like to use those
Hi,
Thanks. I was kind of hoping for something less drastic,
but that works. In Maple there is just a variable you can
set which controls things, so you can do it on a per script
basis.
Thanks.
Tim.
---
Tim Lahey
PhD Candidate, Systems Design Engineering
University of Waterloo
http://www.linke
Tim Lahey wrote:
>
> On Dec 2, 2008, at 10:14 PM, Jason Grout wrote:
>
>>
>> Tim Lahey wrote:
>>> Hi,
>>>
>>> The discussion of imaginary numbers reminded me of a
>>> question I've had for some time. Is there a way to set
>>> what's used for the imaginary unit? I often set it to
>>> _j in Maple
On Dec 2, 2008, at 10:14 PM, Jason Grout wrote:
Tim Lahey wrote:
Hi,
The discussion of imaginary numbers reminded me of a
question I've had for some time. Is there a way to set
what's used for the imaginary unit? I often set it to
_j in Maple and I was wondering if there was any way to
do it
Hi Jason,
OK, thank you very much,
it's clear, now I understand the performance explanation when doing
'CDF(i^2)', sage in this case does not perform a simplification before
coercing to CDF, clearly (for performance reasons),
the key is the represantation of "i^2" as -1, so may this is not
good ?
ggrafendorfer wrote:
> Hi Jason,
> thanks for your suggestion and your detailed answer,
>
> but actually I did not start this thread for performance reasons,
> I did start it to ask why "i^2" is not treated like an exact symbolic
> expression in sage:
>
>
Hi Jason,
thanks for your suggestion and your detailed answer,
but actually I did not start this thread for performance reasons,
I did start it to ask why "i^2" is not treated like an exact symbolic
expression in sage:
--
| Sage
Tim Lahey wrote:
> Hi,
>
> The discussion of imaginary numbers reminded me of a
> question I've had for some time. Is there a way to set
> what's used for the imaginary unit? I often set it to
> _j in Maple and I was wondering if there was any way to
> do it in Sage.
Do you mean the variable th
ggrafendorfer wrote:
> Hi Robert,
> this was not a misunderstanding, there is an "n" missing :-), I
> corrected it:
> I wanted to write
>
> then i^2 should also be of type CDF, but
>
> rather then
>
> the i^2 should also
>
> as an answer to your statement, namely that i^2 is getting turne
Hi,
The discussion of imaginary numbers reminded me of a
question I've had for some time. Is there a way to set
what's used for the imaginary unit? I often set it to
_j in Maple and I was wondering if there was any way to
do it in Sage.
Cheers,
Tim.
---
Tim Lahey
PhD Candidate, Systems Design
Hi Robert,
> > what I want to say is that I nevertheless don't understand why i^2 is
> > not be treated like a symbolic expression ...
> > I hope I will sometimes ..:-)
>
> In your case, it's not treated like a symbolic expression because
> it's not a symbolic expression.
Looks again like a misun
On Dec 2, 2008, at 6:27 PM, ggrafendorfer wrote:
> Hi Robert,
>>> Again, if I want performance I could use i^2.,
>>
>> Um... that's *slower*, right?
>
> I really did not expect that i^2. is slower than i^2,
> in my problem I needed performance, for this I wrote
> i = CDF(I)
> in the first line of
Hi Robert,
this was not a misunderstanding, there is an "n" missing :-), I
corrected it:
I wanted to write
then i^2 should also be of type CDF, but
rather then
the i^2 should also
as an answer to your statement, namely that i^2 is getting turned into
CDF(i)^CDF(2)
I hope this is clear no
Hi Robert,
> > Again, if I want performance I could use i^2.,
>
> Um... that's *slower*, right?
I really did not expect that i^2. is slower than i^2,
in my problem I needed performance, for this I wrote
i = CDF(I)
in the first line of my script, not just for performance, it can also
leed to error
On Dec 2, 2008, at 6:12 PM, ggrafendorfer wrote:
> Hi Robert
>> symbolic expression "i^2" is getting turned into CDF(i)^CDF(2).
>
> the i^2 should also be of type CDF, but
>
> sage: type(i^2)
>
Ah, I think I see the misunderstanding now. i^2 should not be of type
CDF, because i is not of type
On Dec 2, 2008, at 6:04 PM, ggrafendorfer wrote:
>> Perhaps we should special case for (small) integer powers, but that
>> would slow other stuff down. What's happening here is that the
>> symbolic expression "i^2" is getting turned into CDF(i)^CDF(2).
>> Simplification happens on printing, not o
Hi Robert,
> Perhaps we should special case for (small) integer powers, but that
> would slow other stuff down. What's happening here is that the
> symbolic expression "i^2" is getting turned into CDF(i)^CDF(2).
Then "i^2" should be of type CDF, but
sage: type(i^2)
Georg
--~--~-~--
Hi Robert
> symbolic expression "i^2" is getting turned into CDF(i)^CDF(2).
the i^2 should also be of type CDF, but
sage: type(i^2)
Georg
--~--~-~--~~~---~--~~
To post to this group, send email to sage-support@googlegroups.com
To unsubscribe from this group, s
> Perhaps we should special case for (small) integer powers, but that
> would slow other stuff down. What's happening here is that the
> symbolic expression "i^2" is getting turned into CDF(i)^CDF(2).
> Simplification happens on printing, not on construction.
>
> sage: CDF(simplify(i^2))
> -1.0
On Dec 2, 2008, at 5:40 PM, ggrafendorfer wrote:
>
> Hi Michael,
>
>> You are using CDF == Complex Double Field, so numerical noise is
>> to be
>> expected. IEEE arithmetic might be fast, but you pay for that speed
>> with imprecise results. It might be possible to compile without
>> optimizati
On Dec 2, 5:40 pm, ggrafendorfer <[EMAIL PROTECTED]> wrote:
> Hi Michael,
>
> > You are using CDF == Complex Double Field, so numerical noise is to be
> > expected. IEEE arithmetic might be fast, but you pay for that speed
> > with imprecise results. It might be possible to compile without
> > o
Hi Michael,
> You are using CDF == Complex Double Field, so numerical noise is to be
> expected. IEEE arithmetic might be fast, but you pay for that speed
> with imprecise results. It might be possible to compile without
> optimization and get a "correct" result in that case, but that could
> cha
On Dec 2, 5:29 pm, ggrafendorfer <[EMAIL PROTECTED]> wrote:
> Hi,
Hi Georg,
> I'm using sage 3.2 (compiled from sources) on a 32-bit Core Duo
> machine running Debian Etch:
>
> I'm not sure if this bug,
> why does
>
> sage: CDF(i^2)
> -1.0 + 1.22460635382e-16*I
>
> I'm not complaining about th
Hi,
I'm using sage 3.2 (compiled from sources) on a 32-bit Core Duo
machine running Debian Etch:
I'm not sure if this bug,
why does
sage: CDF(i^2)
-1.0 + 1.22460635382e-16*I
I'm not complaining about the "wrong" result, I understand the
following:
sage: CDF(i^2.)
-1.0 + 1.22460635382e-16*I
bu
Hi,
I am not sure why I am not getting the same 3D image than the one at
the bottom of the next page:
http://reference.wolfram.com/mathematica/ref/ParametricPlot3D.html
I am using these commands:
u, v = var('u,v')
parametric_plot3d((u*cos(v),u*sin(v),imaginary(u*exp((I*v)^5)^(1/5))),
(u,0,2), (v
Hmmm,
This works:
R. = PolynomialRing(QQ,"x")
a = x^2 +3*x
b = x^3 - x^2 - x+1
c = a/b
c.partial_fraction_decomposition()
(0, [-1/2/(x + 1), (3/2*x + 1/2)/(x^2 - 2*x + 1)])
So, it likely has to do with the specific a and b since in the
original, a/b works (with a remainder).
Note that this i
Yes,
sage: R. = PolynomialRing(QQ,"x")
sage: a = 3*x^3+x^2+x+5
sage: b = 5*x^2-3*x +1
sage: c = a/b
sage: c.partial_fraction_decomposition()
---
TypeError Traceback (most recent call last)
...
http://modular.math.washington.edu/sage/paper-letter/
Kevin
--~--~-~--~~~---~--~~
To post to this group, send email to sage-support@googlegroups.com
To unsubscribe from this group, send email to [EMAIL PROTECTED]
For more options, visit this group at
http://groups
Hi Robert,
On Dec 2, 5:50 am, Robert Bradshaw <[EMAIL PROTECTED]>
wrote:
> Are you saying you would like to pass in a domain when creating the
> variables? Something like
>
> sage: var('omega', domain=RR)
YES, that would be great.
>
> > Here is the error I found. The result given by omgo.sim
Hi,
I'm working my way through Bronstein's Symbolic
Integration book and one thing I've noticed is
that it appears that in Sage you can work with
symbolics, or polynomials, but not both.
So, if I define:
x = polygen(QQ,'x')
a = 3*x^3+x^2+x+5
b = 5*x^2-3*x +1
I can do, a.quo_rem(b) and all is fi
Hello,
Is there a reason why I cannot do
f(x)=abs(x)
f(vector([1,2,3]))
Many related things work fine:
abs(vector([1,2,3])) # works
def f(x): return abs(x)
f(vector([1,2,3])) # works
Session below shows the trouble.
Thanks,
Scott
[EMAIL PROTECTED]:~$ sage
Tim Lahey wrote:
>
> On Dec 2, 2008, at 4:00 PM, mabshoff wrote:
>> That was discussed in the "Mathematica 7" thread and the conclusion
>> was that PIL (the Python image library) could do much of that
>> functionality. There is no reason not to include it per default in
>> Sage, but so far no one
On Dec 2, 2008, at 4:00 PM, mabshoff wrote:
>>
>
> That was discussed in the "Mathematica 7" thread and the conclusion
> was that PIL (the Python image library) could do much of that
> functionality. There is no reason not to include it per default in
> Sage, but so far no one has started the pro
On Dec 2, 12:56 pm, Tim Lahey <[EMAIL PROTECTED]> wrote:
> Hi,
hi Tim,
> I was looking at a blog post on Mathematica's
> Image Processing features,
>
> http://blog.wolfram.com/2008/12/01/the-incredible-convenience-of-math...
>
> and realized that if the notebook supported the
> image input fea
Hi,
I was looking at a blog post on Mathematica's
Image Processing features,
http://blog.wolfram.com/2008/12/01/the-incredible-convenience-of-mathematica-image-processing/
and realized that if the notebook supported the
image input feature like Mathematica, much of
what's in the blog post could
On Dec 2, 8:37 am, Flavio Coelho <[EMAIL PROTECTED]> wrote:
> Hi,
Hi,
> a recent sage installation damaged my global R installation.
This might be a config issue with RHOME. What does "env | grep RHOME"
return?
> now, every time I try to install a package within R I get the
> following error
Here's a solution to my problem -- I'm pretty sure it could be useful
to other people. Trying to follow the instructions above, I
misinterpreted "unzip the .zip here" (i *always* get these things
wrong).
the way i understood it, i ended up with files like /home/
foobar/.fonts/cmr10.ttf. However,
Hi,
a recent sage installation damaged my global R installation.
now, every time I try to install a package within R I get the
following error message:
cannot open file '/home/was/build/sage-3.1.4/local/lib/R/doc/
CRAN_mirrors.csv', reason 'Ficheiro ou directoria inexistente'
sage must have ch
On Dec 2, 6:55 am, dpvc <[EMAIL PROTECTED]> wrote:
Hi Davide,
> > I'm pretty sure we don't use the easy/load.js (and I'm not sure why).
>
> Probably because it didn't exist when jsMath support was added to
> sage. The easy/load.js file was a relatively late addition to jsMath,
> but certain
many thanks anyways!
On Dec 2, 3:18 pm, mabshoff <[EMAIL PROTECTED]
dortmund.de> wrote:
> On Dec 2, 7:15 am, Keanes <[EMAIL PROTECTED]> wrote:
>
> Hi Hi Keanes,
>
> > Thanks Michael for coming back to me so soon.
>
> > Example:
> > When I click on Product icon on the tool bar and go into stock ta
On Dec 2, 7:15 am, Keanes <[EMAIL PROTECTED]> wrote:
Hi Hi Keanes,
> Thanks Michael for coming back to me so soon.
>
> Example:
> When I click on Product icon on the tool bar and go into stock take.
> I type in the product code and tab, straight away, a window with
> message says - options not a
Thanks Michael for coming back to me so soon.
Example:
When I click on Product icon on the tool bar and go into stock take.
I type in the product code and tab, straight away, a window with
message says - options not avaialble to items marked 'non-stock
items'.
I can't input the stock quantity I a
On Dec 2, 6:56 am, Keanes <[EMAIL PROTECTED]> wrote:
> Hi there,
Hi Keanes,
> I tried to input quantities for stock take for products set as non-
> stock items and it will not allow it. At the moment, all stock level
> reads minus. I would like to put the correct stock level onto sage.
> How c
Hi there,
I tried to input quantities for stock take for products set as non-
stock items and it will not allow it. At the moment, all stock level
reads minus. I would like to put the correct stock level onto sage.
How can I do so for the non-stock items?
Other options would be changing the set u
> We have an optional sage package for the
> image fonts that is easy to install. You're right, we decided to not
> make it standard because of the size.
OK, sounds good.
> Currently, if the jsmath image fonts are not installed, we add the
> following code to the header of the page:
>
> src="/
On Dec 1, 2008, at 10:52 AM, Craig Citro wrote:
>> Question for all: is there a good reason for writing cdef
>> functions? Or
>> should we make all cython functions cpdef? Python convention
>> seems to
>> be to expose the internals of the class, but just mark (with "_" or
>> "__") the funct
are you able to select "native tex fonts" in the jsmaths preferences ?
i can only use "unicode fonts", they look okay but they're not the
usual Tex fonts, that's for sure.
On Dec 1, 5:17 pm, Jason Grout <[EMAIL PROTECTED]> wrote:
> dpvc wrote:
> > The real problem is not the missing fonts, but th
It sounds like he wants a Digital Elevation Model (DEM)
http://en.wikipedia.org/wiki/Digital_elevation_model
and then be able to visualize it. This kind of thing
is usually part of a Geographic Information System (GIS)
http://en.wikipedia.org/wiki/GIS
There is an open source GIS called GRASS
I don't suppose that Sage can do this? It is not clear what the input
would be exactly.
John Cremona
-- Forwarded message --
From: Colin Rourke <[EMAIL PROTECTED]>
Date: 2008/12/1
Subject: Re: maths-staff: Help
To: [EMAIL PROTECTED]
Hi guys
A software problem. Does any
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