I'm getting back into grad school, at the tender age of 68, and am
loving it! The class I'm taking is pretty tough, CS500 .. based on
the upcoming book, The Nature of Computation by Moore and Mertens
(Cris Moore is teaching the class I'm taking).
http://www.nature-of-computation.org/
I'v
On Sun, Feb 28, 2010 at 9:05 AM, Minh Nguyen wrote:
> Hi Bjarke,
>
> On Mon, Mar 1, 2010 at 4:02 AM, Bjarke Hammersholt Roune
> wrote:
>
>
>
>> mvngu in the sage-devel IRC channel wrote:
>
> Here is the relevant IRC log:
>
> 08:45 < SageWWW> I typed this into a Sage worksheet:
> 08:45 < SageWWW>
Hi,
I have a symbolic polynomial system that I would like to characterize
the roots of. Although I know that if there are any roots they are
real and positive, the polynomials involve square roots (of positive
quantities) and sage does not seem to like that and nor does it like
^(1/2). The followi
btw:
sage: a,b,c,= var('a b c'); integrate(1/(a-b-c*sin(x)) ,x,
algorithm="mathematica_free")
-2*arctan(-((a - b)*tan(1/2*x) - c)/sqrt(a^2 - 2*a*b + b^2 - c^2))/
sqrt(a^2 - 2*a*b + b^2 - c^2)
And now you may try newton-leibniz formula
R.
On 28 ún, 18:34, WH27 wrote:
> Can't seem to perform the
Integration is done via Maxima and Maxima also asks about the sign:
Robert
[ma...@thinkpad /opt/sage]$ ./sage -maxima
;;; Loading #P"/opt/sage-4.3.2/local/lib/ecl/defsystem.fas"
;;; Loading #P"/opt/sage-4.3.2/local/lib/ecl/cmp.fas"
;;; Loading #P"/opt/sage-4.3.2/local/lib/ecl/sysfun.lsp"
Maxima 5.
You need to install a dumy package gfortran after you install gfortran-4.3
sudo apt-get install gfortran
then you'll have
/usr/bin/gfortran
available which seems to be required by make process.
and after that it goes very smoothly.
I guess it should be also noted is README.txt that Sage needs gf
I forgot to precise that I would submit another for undirected cycles.
Alex
On 28 fév, 20:32, ablondin wrote:
> Hello, David !
> As Nathann mentionned, I've already submitted a patch which allows one
> to enumerate paths and cycles in directed graphs with a lot of
> possible parameters (length, s
Hello, David !
As Nathann mentionned, I've already submitted a patch which allows one
to enumerate paths and cycles in directed graphs with a lot of
possible parameters (length, starting and ending vertices, etc.).
Since it has received positive review, I'll submit another one for the
next week, so
Dr. David Kirkby wrote:
Alex Ghitza wrote:
Actually, reading the previous messages in this thread, it seems that
gfortran is installed, but the executable is named "gfortran-4.3".
Because of this, the prereq spkg doesn't find it (it's looking for an
executable named "gfortran" in your PATH).
I
Alex Ghitza wrote:
Actually, reading the previous messages in this thread, it seems that
gfortran is installed, but the executable is named "gfortran-4.3".
Because of this, the prereq spkg doesn't find it (it's looking for an
executable named "gfortran" in your PATH).
If you have root access to
Can't seem to perform the integration below
forget()
a, b, c, x = var('a b c x')
assume((c-b+a)*(c+b-a)>0)
f = 1/(a-b-c*sin(x))
integrate(f, x, 2*pi, 0)
error msg - "Is (c-b+a)*(c+b-a) positive or negative?"
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Hi Bjarke,
On Mon, Mar 1, 2010 at 4:02 AM, Bjarke Hammersholt Roune
wrote:
> mvngu in the sage-devel IRC channel wrote:
Here is the relevant IRC log:
08:45 < SageWWW> I typed this into a Sage worksheet:
08:45 < SageWWW> a = 5
08:45 < SageWWW> a
08:45 < SageWWW> using http://www.sagenb.org/ho
I typed this into a fresh Sage worksheet:
a = 5
a
The output I see is just a small green rectangle that disappears in a
few seconds. I get the same thing typing just "1+1". I'm on Firefox
3.5.8.
mvngu in the sage-devel IRC channel wrote:
"I'm getting the same issue with the online Sage noteb
On 27 ún, 10:56, Burcin Erocal wrote:
> Hi Robert,
>
> On Fri, 26 Feb 2010 17:14:22 -0800 (PST)
>
> "ma...@mendelu.cz" wrote:
> > Holding symbolic expressions has been requested several times here.
> > For example [1]-][4]. Is there something new in this topic? Now or in
> > near future?
>
> He
On Sun, Feb 28, 2010 at 8:57 AM, Nathann Cohen wrote:
> Hello
>
> By the fundamental circuits, do you mean a base of the Cycle space ?
> If so, I have to admit I do not know how to do it...
I just posted some code to compute the cycle space to
http://sage.math.washington.edu/home/wdj/resear
Hello
By the fundamental circuits, do you mean a base of the Cycle space ?
If so, I have to admit I do not know how to do it...
If you want to compute a shortest cycle in a graph, though, I do not
think the girth function can do it at the moment, but I agree it would
be useful to have for su
Right. It was indeed merely a "problem" of gfortran name.
Thanks for your support.
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Here is a better version:
def fundamental_cycle(G, T, e):
"""
Finds the unique cycle associated to the
spanning tree T of G and the edge e of G not in T.
INPUT:
G - a connected graph
T - a spanning tree
e - an edge of G not in T
OUTPUT:
the uni
I'll answer my own question:-)
There is an easily written function which does this:
def fundamental_cycle(G, T, e):
"""
Finds the unique cycle associated to the
spanning tree T of G and the edge e of G not in T.
INPUT:
G - a connected graph
T - a spanning tree
Actually, reading the previous messages in this thread, it seems that
gfortran is installed, but the executable is named "gfortran-4.3".
Because of this, the prereq spkg doesn't find it (it's looking for an
executable named "gfortran" in your PATH).
If you have root access to this machine, I sug
Hi:
I'm trying to compute fundamental circuits of a
graph in Sage and am getting stuck. Is this implemented?
Here is an example:
sage: G = graphs.HeawoodGraph()
sage: TG = G.subgraph(edges=G.min_spanning_tree())
sage: e = G.edges()[-1]
sage: TG.edges()
[(0, 1, None), (0, 5, None), (0, 13, None),
On Feb 28, 5:44 am, Marshall Hampton wrote:
> I'm not sure this is the best answer, but you could do:
>
> A = matrix(SR,[[a,b],[c,d]])
> v1,v2 = A.eigenvalues()
> show((A-v1).left_kernel().basis()[0])
> show((A-v2).left_kernel().basis()[0])
>
> Perhaps part of the issue is that these do not have
Hi,
On Sun, Feb 28, 2010 at 9:17 PM, bourbabis wrote:
> checking for gfortran... no
> checking whether we are using the GNU Fortran compiler... no
> checking whether accepts -g... no
> configure: Since Sage 4.3.1 a Fortran compiler is required on all
> operating
> configure: systems except OS
Hi.
When I type "make" right after I've untared the source (without
setting any environment
variable) I get the following log :
cd spkg && ./install all 2>&1 | tee -a ../install.log
make[1]: entrant dans le répertoire « /opt/Sage-4.3.3/spk
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