Hi
I’m on a MacBook Pro (IntelCore duo, 2.6 GHz, i5) running on OS X 10.10.5
(Yosemite) and I encounter a problem after upgrading Safari.
I was working on Sage-6.4.1 until now and it worked perfectly.
But now, I get a window in Safari with "localhost:8080/?startup_token » (what
does it mean?) a
On Sep 22, 4:23 pm, phil <[EMAIL PROTECTED]> wrote:
> On Sep 15, 10:26 am, Martin Albrecht <[EMAIL PROTECTED]>
> wrote:
> The original machine I was using was needed for other things. So, I
> ran it on sage 3.1.2rc4 on sage.math.washington.edu and it completed
>
On Sep 15, 10:26 am, Martin Albrecht <[EMAIL PROTECTED]>
wrote:
> On Monday 15 September 2008, phil wrote:
>
> > I've been pushing the limits of determinant calculation over
> > multivariate polynomial rings. I can calculate determinants of
> > matrices u
On Sep 15, 10:08 am, "William Stein" <[EMAIL PROTECTED]> wrote:
> How much RAM do you have? Write to me off list if you want access
> to a machine with more :-)
Ok. I'll send you an off list message.
I'm running Sage on 64 bit Ubuntu installed in a VMWare Infrastructure
virtual machine with 6
I've been pushing the limits of determinant calculation over
multivariate polynomial rings. I can calculate determinants of
matrices up to 9x9 of the form [[x_0_0, x_0_1],[x_1_0, x_1_1]] (each
element is a single unique variable). When I get to 10x10 is runs for
a while the crashes with:
Unhan
On Sep 5, 10:14 am, Martin Albrecht <[EMAIL PROTECTED]>
wrote:
>
> sage: %time d2 = R(C._singular_().det())
> CPU times: user 0.04 s, sys: 0.01 s, total: 0.05 s
> Wall time: 0.15 s
This seems to scale very poorly with the number of variables.
Basically, it's impractical to compute determinants
Is there a way to create a matrix whose elements are variables in a
symbolic ring or polynomial ring without naming all the elements
manually?
For example, I've been doing something like:
vars('x11,x12,x21,x22')
X = matrix([[x11,x12],[x21,x22]]);
However, this becomes impractical once the matrix
On Sep 5, 10:14 am, Martin Albrecht <[EMAIL PROTECTED]>
wrote:
> On Friday 05 September 2008, phil wrote:
>
> > R. = QQ[]
> > C = random_matrix(R,10,10)
> > Cdet = C.determinant()
>
> Here's a workaround:
> sage: %time d2 = R(C._singular_().det())
T
I have a matrix that is composed of multivariant polynomial
entries. I want to compute its determinant. The problem is that it
is very slow or runs out of memory. For example,
R. = QQ[]
C = random_matrix(R,10,10)
Cdet = C.determinant() # this line takes a long time
If you have more variabl
How can I continue a line inside a < >?
I want to write something like "A. = ZZ[]" over two lines.
After typing "A.http://groups.google.com/group/sage-support
URLs: http://www.sagemath.org
-~--~~~~--~~--~--~---
On Jul 2, 8:33 pm, "Mike Hansen" <[EMAIL PROTECTED]> wrote:
> sage: var('x,y')
> (x, y)
> sage: t = x^2 + y^2
> sage: type(t)
>
> sage: t._operator
>
> sage: t._operands
> [x^2, y^2]
> sage: t._operands[0]
> x^2
How can I do comparisons on the operator? I need to test the operator
so that I
> sage: var('x,y')
> (x, y)
> sage: t = x^2 + y^2
> sage: type(t)
>
> sage: t._operator
>
> sage: t._operands
> [x^2, y^2]
> sage: t._operands[0]
> x^2
It looks like you can access the expression as a tree of binary
operators and their operands this way.
However, the order of the operands in th
I've looked around in the documentation but have not been able to
figure out how to access individual terms in an symbolic expression.
For example:
var('x,y')
t = x^2 + y^2
How do I access the first term in t? I want to assign it to another
variable, like first_term = t.extract_term(t,1) to get
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