r 5, 2019 at 1:43:23 AM UTC-8, Robert Samal wrote:
>
> I noticed the following strange behavior of
> graph6_string()/sparse6_string() functions of graphs:
>
> sage: K2=graphs.CompleteGraph(2)
> sage: P=K2.cartesian_product(K2)
>
> sage: print(P.sparse6_string())
> sage
I noticed the following strange behavior of
graph6_string()/sparse6_string() functions of graphs:
sage: K2=graphs.CompleteGraph(2)
sage: P=K2.cartesian_product(K2)
sage: print(P.sparse6_string())
sage: print(Graph(P.graph6_string()).sparse6_string())
:CoKN
:Cci
To explain: I understand,
I observed the following weird behavior of the symbolic engine.
sage: x/x
1
sage: x^2/x
x
sage: (x^2+x)/x
(x^2 + x)/x
sage: assume(x>0)
sage: assume(x,'real')
sage: assumptions()
[x > 0, x is real]
sage: (x^2+x)/x
(x^2 + x)/x
To clarify: first, I consider the first two simplifications slightly
Indeed it works in Sage 8.4.
Thanks!
On Wednesday, October 9, 2019 at 8:34:41 AM UTC-7, Dima Pasechnik wrote:
>
> This got broken in Sage 8.5.
> (still works in 8.4)
>
>
>
> On Wed, Oct 9, 2019 at 6:09 AM David Joyner > wrote:
>
>>
>>
>> On Wed,
Sorry, F=GF(3), I made my original example shorter and didn't read it
properly.
So the full problematic code is
B=matrix(GF(3), 2,2,[1,0,1,0], sparse=True)
v=vector(GF(3), [1,1])
B.solve_right(v)
Thanks,
Robert
On Tuesday, October 8, 2019 at 5:17:59 PM UTC-7, Robert Samal wrote:
>
>
I am trying to solve a rather large linear systems of equations of GF(3).
As the matrices are sparse, I thought that adding "sparse=True" to the
constructor of the matrix could be of help. However, I ran to a strange
error message.
B=matrix(GF(3), 2,2,[1,0,1,0], sparse=True)
v=vector(F,
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f627fec5000)
On Thursday, January 7, 2016 at 6:38:53 PM UTC+1, Volker Braun wrote:
>
> Can you tell us more about what eog links to?
>
> $ sage -sh command -v eog
> /usr/bin/eog
> $ sage -sh ldd /usr/bin/eog # adjust path as necessary
>
> Also, are you overridin
Hi,
I'm trying to compute something using multivariate polynomials, and am
struggling to understand the relation between polynomials of type type
'sage.rings.polynomial.multi_polynomial_libsingular.MPolynomial_libsingular'
and of type class
Thanks John!
Your suggestion
sage: p.solver_parameter(simplex_or_intopt, simplex_then_intopt)
Works nicely also on sage v5.2.
It would be worth to document it though.
p.solve? doesn't mention anything (p = MixedIntegerLinearProgram() ),
p.solver_parameter says that GLPK specific
way how to distinguish these two cases?
I suppose I could use cvxopt, but I fear it would be too slow for the real
program I want to use it for.
Thanks in advance,
Robert Samal
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Hi!
By some random experiments I discovered the following weirdness:
sage: bool(piInfinity)
False
sage: bool(piInfinity)
True
So far it seems that pi Infinity is the only misbehaving comparison:
sage: bool(pi2*pi)
True
sage: bool(2*piInfinity)
True
sage: bool(eInfinity)
True
sage:
Thanks a lot, Dmitrii!
It works for me now. (Actually for quite some time, but now I can happily
report, that
compared to cvxopt that I was using before, using csdp is about 10-times
faster!)
I didn't know about sage -sh , that is a very useful trick (perhaps it
should
be documented more, or
disagrees. Who is right? :-)
What can I do to get the solution automatically, without substituting tan
manually?
Thanks,
Robert Samal
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Can you post the logs from doing sage -python setup.py instasll, as well
as explicit instructions (where to download, etc.) for how to duplicate
the error?
Sure. It's rather long, but I suppose if it works it would be useful for
other people, too. I was hoping someone could spot the
Speaking about solve(), is there a place to report equations it cannot
solve
(and I believe it should?).
I suppose putting it on the same Trac ticket is wrong practice? But
should
it be another ticket, or some yet other place?
Robert
Yup. solve() probably needs a general overhaul (and has for
The following code should produce a drawing of the
Frucht graph with edges labeled 0 upto 17.
However, labels 16 and 17 are missing, while
15 is misplaced. The edge labels are set correctly
(as the last line shows), they only don't show up.
The weird thing is that other graphs work OK (at least
I observed that solve behaves inconsistently in the following regards:
sage: solve([x==1,x==-1],x)
[]
(this is as expected)
However:
solve([x==1,x==-1],x, solution_dict=True)
produces an error message. Easy to live with, but I was scared when I
first saw it :-).
It should be easy to correct,
Hi Minh,
I think this issue has been fixed in sage-3.1.4. Under sage-3.1.4, the
command
sage: lim ( x*(sqrt(x^2)-sqrt(x))/sqrt(x^2 -x), x=oo)
+Infinity
returns what you'd expect.
That's great news, perhaps I should update more frequently.
By any chance, does somebody know what was the
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