[sage-support] Re: feature request - worksheets labels.

2010-02-01 Thread Kakaz
On 1 Lut, 00:34, William Stein wrote: > 2010/1/31 Kakaz : > > > I have several worksheets in my sage, and when I have some new ideas I > > create other one, somethimes just for fun. So there are worksheets > > named: "Idea 1", "Matrices", 'FFT", "FFT3" etc. After a month I do not > > remember wh

[sage-support] Re: feature request

2009-04-07 Thread Flavio Coelho
Thanks, I think I'll do both: ask for an account, so that I can report bugs, and post about my feature request here (I'll open a new thread, so that the subject will be informative) Flávio On 7 abr, 16:20, davidloeffler wrote: > Hi Flavio, > > You can have a trac account if you like -- it's on

[sage-support] Re: feature request

2009-04-07 Thread davidloeffler
Hi Flavio, You can have a trac account if you like -- it's only as an anti-spam measure that we require a login. Just email Michael Abshoff (address on the trac front page). It's possible to create new tickets for feature requests; these should be allocated to the milestone "sage- wishlist". Tha

[sage-support] Re: feature request ...

2008-04-04 Thread harald schilly
On Apr 3, 3:15 am, Georg <[EMAIL PROTECTED]> wrote: > > exponentiation, > i don't konw if this is implemented or a topic here, but there exists also the logarithm of a matrix. h --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups

[sage-support] Re: feature request ...

2008-04-03 Thread Mike Hansen
Hello, > sage: r = matrix(SR, 4, 4, [[21,17,6,8], [-5,-1,-6,-3], [4,4,16,2], > [2,3,-4,-1]]) > sage: r.exp() > . This is happening since Maxima is failing to do the computation for reasons that I don't know. I suppose it wouldn't be too difficult to write our own matrix exponentiation.

[sage-support] Re: feature request ...

2008-04-03 Thread Georg
> sage: matrix(SR, 3, 3, [[21,17,6],[-5,-1,-6],[4,4,16]]).exp() > > [ (13*e^16 - e^4)/4 (13*e^16 - 5*e^4)/4 (e^16 - e^4)/2] > [ (e^4 - 9*e^16)/4 (5*e^4 - 9*e^16)/4 (e^4 - e^16)/2] > [ 4*e^16 4*e^16e^16] > this does not work for 4x4 matrices,

[sage-support] Re: feature request ...

2008-04-02 Thread Jason Grout
Georg wrote: > Thank you for the fast answer Mike, > >> What functionality did you envision having in a symmetric matrix class? >> > > In general (not specific to the hermitian (symmetric) property) > exponentiation, > determinate, > elementary matrix operations: > - changing rows(colums) > - mu

[sage-support] Re: feature request ...

2008-04-02 Thread Georg
Thank you for the fast answer Mike, > > What functionality did you envision having in a symmetric matrix class? > In general (not specific to the hermitian (symmetric) property) exponentiation, determinate, elementary matrix operations: - changing rows(colums) - multiplication of specific rows(c

[sage-support] Re: feature request ...

2008-04-02 Thread Mike Hansen
Hi Georg, There is currently support for taking the matrix exponential of a symbolic matrix already in Sage since it is using Maxima in the background. I suppose that this should be extended to other types of matrices. sage: matrix(SR, 3, 3, [[21,17,6],[-5,-1,-6],[4,4,16]]).exp() [ (13*e^16 -

[sage-support] Re: feature request/proposal concerning the method nearby_rational

2008-01-31 Thread Paul Zimmermann
John, > A variation of this, which would be useful in some elliptic curve > calculations, would be a function > RR(x).nearby_rational_whose_denominator_is_a_perfect_square(). > > For either problem, is there a better solution than going through the > continued fraction convergents until o

[sage-support] Re: feature request/proposal concerning the method nearby_rational

2008-01-31 Thread John Cremona
A variation of this, which would be useful in some elliptic curve calculations, would be a function RR(x).nearby_rational_whose_denominator_is_a_perfect_square(). For either problem, is there a better solution than going through the continued fraction convergents until one is found which has the