Re: [sage-support] issue with combining sub lists into a list

On Mon, 09 Jan 2012 at 10:39AM -0800, Eric Kangas wrote: > Hi, > > I have a list of sublists where I would like to combine these sub > lists into one list. > > Here is my code where I created this list of sublists. I see you've gotten one answer, but I thought I would add that this is really jus

Re: [sympy] Re: [sage-support] Solving differential equations with unit_step?

2012/1/9 Aaron Meurer > Thanks to Tom's Google Summer of Code project, SymPy can indeed solve > this problem. The code is only in the git master, but will be included > in SymPy 0.7.2. > This looks pretty good, I will try and compile the git version. Thanks. -- Renan Birck Pinheiro, Grupo de M

Re: [sympy] Re: [sage-support] Solving differential equations with unit_step?

And I should note that Tom's code can also compute the Laplace transform if you want to do it that way: In [13]: var('s') Out[13]: s In [14]: inverse_laplace_transform(exp(-5*s)/s, s, t) Out[14]: Heaviside(t - 5) Aaron Meurer On Mon, Jan 9, 2012 at 1:36 PM, Aaron Meurer wrote: > Thanks to Tom'

Re: [sympy] Re: [sage-support] Solving differential equations with unit_step?

Thanks to Tom's Google Summer of Code project, SymPy can indeed solve this problem. The code is only in the git master, but will be included in SymPy 0.7.2. In [3]: dsolve(Derivative(y(x),x) - Heaviside(-5 + x), y(x)) Out[3]: ⎧ │x│ y(x) = C₁ + 5⋅⎪

Re: [sage-support] Re: Strange interaction between sage and numpy

Created this ticket for the numpy array to matrix issue: http://trac.sagemath.org/sage_trac/ticket/12287 On Mon, Jan 9, 2012 at 4:20 PM, Volker Braun wrote: > Sure! I suspect it would be relatively easy to fix > in sage/matrix/constructor.py if you want to give it a try! But in any case > please

Re: [sage-support] Solving differential equations with unit_step?

2012/1/9 David Joyner > AFAIK, Sage cannot at this time take the inverse Laplace transform of > something of the form e^{-5s}/s. > > And indeed it can't. sage: F = e^(-5*s)/s sage: F.inverse_laplace(s,t) ilt(e^(-5*s)/s, s, t) -- Renan Birck Pinheiro, Grupo de Microeletrônica

Re: [sage-support] Solving differential equations with unit_step?

AFAIK, Sage cannot at this time take the inverse Laplace transform of something of the form e^{-5s}/s. I think Sympy (included with Sage) can http://docs.sympy.org/dev/modules/integrals/integrals.html#integral-transforms but I don't think it's been integrated together with initial conditions: >>>

Re: [sage-support] issue with combining sub lists into a list

> [[1],[2,8,4,6],[1,2,7],[9,3,4,6],...] > [[1],[14,17,18,19],[1,4,11],[9,14,16,19],...] > > would like to figure out how to get both results like this: > > [1,2,8,4,6,1,2,7,9,3,4,6,...] > [1,14,17,18,19,1,4,11,9,14,16,19...] Two ways come to mind: sage: a = [[1],[2,3,4],[5,6,7]] sage: a [[1], [2,

[sage-support] issue with combining sub lists into a list

Hi, I have a list of sublists where I would like to combine these sub lists into one list. Here is my code where I created this list of sublists. p = list(str(n(pi, digits = 200))) p.remove('.') p1 = [int(x) for x in p] l1 = [0,1,0,6,2,0,1,2,0,9,1,7,2,8,3,4,4,8,4,6] l31 = [[x for x,y in zip(

[sage-support] Re: Solving differential equations with unit_step?

On 9 jan, 15:39, Renan Birck Pinheiro wrote: > Hi, > > I'm trying to solve a differential equation with unit step, e.g. the > equation y'(x) = U(x-5) - where U is the unit step, and the inicial > condition y(0) is 0. > sage: desolve(diff(y,x) - unit_step(x-5),y,ics=[0,1]) Oops. I made a typo

[sage-support] Solving differential equations with unit_step?

Hi, I'm trying to solve a differential equation with unit step, e.g. the equation y'(x) = U(x-5) - where U is the unit step, and the inicial condition y(0) is 0. The result is 0 for 05 (it's a simple integral of the unit step function). WolframAlpha gives the correct result [1], however sage fail

Re: [sage-support] Re: Strange interaction between sage and numpy

Sure! I suspect it would be relatively easy to fix in sage/matrix/constructor.py if you want to give it a try! But in any case please open a ticket. -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@goo

Re: [sage-support] Re: Strange interaction between sage and numpy

On Sun, Jan 8, 2012 at 6:23 PM, Volker Braun wrote: > Just noticed the following: > > sage: import numpy as np > sage: r=10 > sage: c=76 > sage: A = 2*np.random.randint(2, size=(r,c))-np.ones((r,c),dtype=np.int) > sage: A = matrix(QQ,A) > sage: A > 10 x 76 dense matrix over Integer Ring (type 'pri

[sage-support] Output processing and formatting delay in Notebook

Hello! This code in Sage Notebook: for i in range(7): html('alert("Text %g");' % i) time.sleep(1) gives no alert messages before cell completely calculated? Is there any way to force immediate output processing? P.S. Sorry for duplicating question, it has already posted at asksage (http