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20200312 14:24:18 +0100  asked a question  How can I perform matrix operations in a transcendental extension of Q? I have three variables $p_w, p_i, p_f$. I want to construct a matrix whose entries are members are rational polynomials in these variables and perform computations with this matrix (ultimately diagonalize it and obtain a general formula for its $n$th power). But I want to do this computation symbolically, treating the three variables as transcendental elements adjoined to $\mathbb Q$. How an I do this? 
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20161101 13:17:50 +0100  commented answer  How to input from file? You say "create a file", but where do I put it? If I put it in the Sage directory, it doesn't seem to see it. 
20161024 17:30:39 +0100  asked a question  I want my plotting function to treat numbers as numbers, not variables I'm creating a plot, like this: The function f looks basically like this: That works. Now I introduce a vector v like this: That works. But if v is the solution of an equation, like this: Now Sage can't handle the subtraction u  v:
So okay, I get that basically what's happening is that u consists of symbolic polynomials in x and y, but v consists of actual numbers, or something like that. But why is it not a problem when v is defined explicitly by How can I solve the matrix equation Mx = 0 in such a way that the vector I get can be subtracted from u? Note that M is singular in my case, with nullity 1, so I need to be able to get an arbitrary vector out of its nullspace. 
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20130705 12:10:36 +0100  marked best answer  .plot() displaying cycle graphs as huge pretzels I don't agree with your very offensive criticism about pretzels. This being said, and if you have no taste for food, you can give this a try : Now that I think of it, given the choice I would also chose a calamari over a pretzel. Hence it all makes sense, after all. Nathann 
20130705 12:10:29 +0100  commented answer  .plot() displaying cycle graphs as huge pretzels That said, now the vertices get grouped so close together I can't see the arcs  any way to make them longer, or increase the size of the "canvas"? 
20130705 12:00:18 +0100  commented answer  .plot() displaying cycle graphs as huge pretzels Thanks. Are there any guidelines on a reasonable amount of iterations to use, as a function of the number of vertices? I'm just going with vertices*2000, but it seems like this is excessive for smaller numbers of vertices  Circuit(5) does well with just 50 iterations. 
20130705 11:01:28 +0100  asked a question  .plot() displaying cycle graphs as huge pretzels That big morass of vertices on the left is actually just a single cycle. Is there any way to get Sage to render it more sensibly? I'd use I suspect this might just be Sage trying to fit the large cycle into a small space, is there some way to tell it what size image to use? 
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20130705 10:00:49 +0100  asked a question  Finer control on how digraphs are plotted I'm drawing some digraphs: I'd like to control the visual output of I would like to:

20130705 07:45:29 +0100  commented answer  Getting to the command line in Windows Wait, I think I've got it. So I can use the notebook in my host OS? That's neat. 
20130705 07:43:43 +0100  commented answer  Getting to the command line in Windows Can I switch back to the notebook from there? If I try `notebook()` I just get: Another Sage Notebook server is running, PID 1160. Opening web browser at http://localhost:8000/ ... sage: xdgopen: no method avilable for opening 'http://localhost:8000/' 
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20130705 07:15:12 +0100  marked best answer  Getting to the command line in Windows You can use the Sage commandline within the VM. Checkout http://wiki.sagemath.org/SageApplianc... 
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20130704 15:07:39 +0100  asked a question  Getting to the command line in Windows When I open the Sage 5.9 OVA file in VirtualBox, Fedora boots and Chromium immediately fills the VM window, allowing me to use the Sage notebook. Is there any way to use it in command line mode under Windows? 