Hi,
Does anyone know of research being done in sage on combinatorial
optimization like the traveling salesman and vehicle routing problems?
Thanks,
Chris
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I am able to manipulate the functions, but I am unable to plot them.
Here is the code:
a,l,x,y,u,v,xdot,ydot,udot,vdot = var('a,l,x,y,u,v,xdot,ydot,udot,vdot',
domain = RR)
i = var('i', domain = QQ)
xdot = x;
ydot = y;
udot = u^2+v;
vdot = v^2+u;
N =
matrix([(diff(xdot,x)-l,diff(xdot,y
You'd want to make sure this behavior is well documented, otherwise it
could have unexpected behavior (e.g. what happens if you try to plot
it? Is 10.5 treated as a degree or radian?)
I'll be prudent since I am the user. It is not intended to be plotted.
What I'm doing is a class "Angle" that
On Thu, Mar 15, 2012 at 8:48 AM, Laurent wrote:
>
>> and it would not make very much sense to provide a method for this
>> class to test for integrality, since every such element is an Integer
>> by definition. I suspect that in your intended application, A will be
>> the result of come computati
and it would not make very much sense to provide a method for this
class to test for integrality, since every such element is an Integer
by definition. I suspect that in your intended application, A will be
the result of come computation resulting in a real number, and you
want to test whether
Laurent,
I your question you gave an example where you set A=4, after which A
has the type Integer:
sage: A=4
sage: type(A)
and it would not make very much sense to provide a method for this
class to test for integrality, since every such element is an Integer
by definition. I suspect that in
On Mar 15, 3:15 pm, Jason Grout wrote:
> On 3/15/12 9:05 AM, William Stein wrote:
> > sage: RealNumber = lambda x: RealField(100)(x)
> > sage: 2.5
> > 2.5000
> > sage: 4.2992038490283409823094820938492834082093482834
> > 4.2992038490283409823094820939
> I'm curious: why
On 3/15/12 9:05 AM, William Stein wrote:
On Thu, Mar 15, 2012 at 6:53 AM, Daniel Krenn wrote:
How do I change the default precision used? E.g. I want to enter {{{a
= 1.2}}} and want that a is an element of RealField(100) without
explicitly telling to use that field each time.
What does not wor
On Thu, Mar 15, 2012 at 6:53 AM, Daniel Krenn wrote:
> How do I change the default precision used? E.g. I want to enter {{{a
> = 1.2}}} and want that a is an element of RealField(100) without
> explicitly telling to use that field each time.
>
> What does not work is:
> sage: RR = RealField(100)
>
How do I change the default precision used? E.g. I want to enter {{{a
= 1.2}}} and want that a is an element of RealField(100) without
explicitly telling to use that field each time.
What does not work is:
sage: RR = RealField(100)
sage: a = 1.2
sage: a.parent()
Real Field with 53 bits of precisio
Hi Noud!
On 15 Mrz., 13:28, Noud Aldenhoven wrote:
> Is it possible to make a non-commutative ring over QQ with three
> generators x, y and z in Sage? So is it possible to make some sort of
> polynomial ring Q[x, y, z] with the extra properties that xy /= yx, xz
> /= zx and yz /= zy?
Do you mean
3.
If, in your application, it is enough to know whether the given object
x is equal to an integer, then you could do "x in ZZ". Note that this
property has nothing to do with the type!
CONCLUSION:
We already have four different meanings of the question "Is x an
integer?". Since different m
Hello Sage-support,
Is it possible to make a non-commutative ring over QQ with three
generators x, y and z in Sage? So is it possible to make some sort of
polynomial ring Q[x, y, z] with the extra properties that xy /= yx, xz
/= zx and yz /= zy?
Best regards,
Noud
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Hi Laurent,
On 15 Mrz., 12:30, Laurent wrote:
> In order to test of something is integer, is it safe to use isinstance ?
> isinstance(A,sage.rings.integer.Integer)
There is a (deprecated) function is_Integer, that does exactly the
"isinstance" test. Whether it is safe or not depends on you
appli
Hi all
Why does 'sage.rings.integer.Integer' not have "is_integer" method ??
sage: A=4
sage: A.is
A.is_idempotent A.is_nilpotent A.is_perfect_power A.is_prime
A.is_square A.is_zero
A.is_integral A.is_norm A.is_power
A.is_prime_powerA.is_squarefree
Hi all,
I'm glad to inform you about new release 0.38 (2012-March-15):
OpenOpt:
interalg can handle discrete variables
interalg can handle multiobjective problems (MOP)
interalg can handle problems with parameters fixedVars/freeVars
Many interalg improvements and some bugfixes
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