20190129 12:41:20 0500  answered a question  possible to solve this optimizationproblem with LMI? Yes, semidefinite optimisation is available in Sage, check out 
20181217 23:09:09 0500  commented answer  ImportError: No module named 'sage' put that one like into a file, and source it every time you want to start anaconda. (Better, make a script that sources this line and starts Anaconda for you). 
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20180322 11:19:56 0500  commented question  save/load session in standalone python In ipython there are special tools for this (I guess they are used in e.g. Jupyter notebook environment to save the state), see e.g. https://stackoverflow.com/questions/2... 
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20180305 20:40:52 0500  answered a question  Error with is_prime Thanks. This is the fix (the whole 
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20171005 05:17:08 0500  commented question  Build Error when Uploading Notebooks in Sage thanks, see https://github.com/sagemath/sagenb/is... for this problem. 
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20170718 04:30:22 0500  commented answer  Submatrix of a given matrix by deleting some rows and columns(For my case 2 rows and columns). Well, but this is a straightforward Python loop to write. In the loop, create two lists, say, ro, co, using range(), remove ith (resp. jth) elements from it, call A[ro,co].det()/A[ro,ro].det() to compute the corr. determinant ratio, store it in B. 
20170718 02:45:35 0500  commented question  How to obtain the resistance distance matrix of a graph? I imagine that scipy does not convert the pseudoinverse exactly. Anyhow, please specify the example of a graph on which you see the problem. 
20170718 02:18:34 0500  commented answer  Restricted usability of Singular after upgrade there is a little 'V' field under the answer score counter on the right, which one ticks to accept the answer. I just did it here. 
20170718 02:15:30 0500  answered a question  Submatrix of a given matrix by deleting some rows and columns(For my case 2 rows and columns). You can create lists of rows and columns and use them to cut out a submatrix. E.g. 
20170211 12:27:00 0500  commented answer  highest dimension polyhedron no, not really. See https://arxiv.org/pdf/math/9909177.pdf for bounds and examples. E.g. in dimension 13 you might have more than 17000000 facets. 
20170209 14:27:16 0500  answered a question  highest dimension polyhedron this depends on the input quite a bit. Namely, the following factors play a big role:

20170209 14:05:41 0500  commented answer  Restricted usability of Singular after upgrade Why would you think this is Singular problem? Univariate polynomials are not handled by Singular in Sage, they are handled by either Flint, or NTL, or Givaro (the latter for finite fields only). We need more info to track your issue down. E.g. could you at least tell us the output of 
20160728 03:08:22 0500  commented question  second degree irreducible polynomial over extension field I presume the question is about how to build a quadratic extension of GF(8) explicitly. 
20160728 02:08:54 0500  answered a question  Faster function for working with cosets Here is an example of how to get a list of coset representatives: Please feel free to ask for more details. 
20160726 10:43:19 0500  commented answer  Semimonomial transformation group I am not 100% sure that you want to start with the permutation group  it might be a proper quotient of the "real" group, and then you need to do something else. 
20160726 10:42:10 0500  answered a question  Semimonomial transformation group will give you the underlying permutation group. It has 1 orbit in its natural action (on 8 points): You can convert it into a matrix group acting on GF(4)^8. Now you can compute orbits on vectors (see e.g. code in 
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20160404 13:23:39 0500  commented question  osx installation sounds like you've changed the default OS configuration, as on OSX the system python is still python2, and this means that you won't see any missing brackets in print, normally speaking. What is that extra hack that you have on? Homebrew? Anaconda? Something else? 
20151103 08:56:21 0500  commented answer  After upgrade to 6.9 we obtain SIGILL ... I take this as you have an upgraded Mac, right? And which version of OSX? (IMHO it's a nonstandard config anyway, and you'd be best off building from source.) 
20150512 11:10:03 0500  answered a question  public.pem File Not Created in OSX Lion please see https://github.com/sagemath/sagenb/is... 
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20150413 05:48:54 0500  answered a question  Matrix dot multiplication slowness and BLAS versions numpy in Sage uses Atlas for matrix operations; if you use a binary Sage installation then Atlas might be not optimised for your hardware. To get good Atlas performance, the best is to build Sage from source. 
20150210 03:23:06 0500  answered a question  System of 3 equations in 3 variables with symbolic coefficients I very much doubt that there are closed form solutions for such a system. It looks like this would imply that univariate polynomial equations of arbitrary degrees have a closed form solution, which is wellknown not to be the case. 
20150206 11:31:52 0500  answered a question  Build command for LaTeX project as a last resort, open the terminal, run latex or pdflatex there... 
20150205 03:25:27 0500  commented question  Browser needed I guess no, that's good as it is. 
20150204 14:11:50 0500  commented answer  Multiuser environment yes, ControlC is good. One can also run 'sage n'  this immediately opens the notebook.` 
20150204 07:23:22 0500  commented answer  Multiuser environment in case you might like to know where the notebook files are: they are in ~/.sage/ for the account Sage (nb) is executed from.Thus each user in this configuration will have completely own set of notebooks. 
20150203 03:41:43 0500  commented answer  Multiuser environment a regular Linux user's notebook() will be run in his/her Linux account. They will be admin for this notebook server, by default (unless they specify another user in notebook() call, or log in via the browser to another, suitably created, nb account). 
20150203 03:33:11 0500  commented answer  Multiuser environment In the latter case you don't even need Sage nb users to have Linux accounts on the server, but watch out for security settings in this case... 
20150203 03:31:14 0500  commented answer  Multiuser environment There are two things you can do  either let each user on the machine to run Sage separately, just by running /usr/tmp/sage/sage6.4.1/sage, or you run a "public" Sage nb server. In the latter setup accounts on the (Linux) server have nothing to do with accounts on the Sage nb server. 
20150201 12:59:55 0500  commented question  Multiuser environment have you installed it systemwide, or in your own account? 
20150201 03:10:56 0500  answered a question  How do I register so I can use the Sage Notebooks You don't have to "register" for this. You just have to set up a password. Try starting notebook from Sage prompt as follows This should allow you to choose a new password for the admin user (admin is the user id for the sage notebook that already exists). 
20150123 15:36:35 0500  commented answer  Cannot install Cremona database as you see, "Use 100%" means "no room left"... I'd let it be 3050GB instead of 6.8GB. Regarding the resizing, there is plenty of info on the net, e.g. http://derekmolloy.ie/resizeavirtua... 
20150122 02:59:21 0500  commented answer  Cannot install Cremona database to see how much space you have in VM, please run, in VM's terminal, the command 
20150119 15:42:49 0500  commented question  Is there a bug with using chromatic_number together with Gurobi? to reproduce this, it would be good to know precisely on what G it hangs, and also your Gurobi and Sage versions... 
20150102 07:26:36 0500  commented question  Jmol applet in Sage 6.3 cannot load how about the latest stable version of Sage, 6.4.1? 
20141223 08:48:11 0500  answered a question  PYCURL ERROR 7 trying to install pdflatex Sorry, but this is certainly not Sagespecific problem, rather it is a CentOSspecific weirdness If you google this error, you'll see plenty of discussions about it; apparently it's about ip6. 
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20141213 19:41:43 0500  commented answer  no method available for opening http localhost 8000 (second part) probably  although perhaps the VM Sage image has it differently. One can see the port number if you start sage in terminal and do 'notebook()' at sage prompt. It will tell you which URL to open in browser. 
20141213 07:23:29 0500  answered a question  no method available for opening http localhost 8000 (second part) I suppose this is described in Sect 6.3.1 of https://www.virtualbox.org/manual/Use... Sage notebook runs a webserver that is to be accessed on port 8000 (and this happens inside VM, on "guest OS"). You need a setting that maps this port to a port X (X need not be equal to 8000) on the "host OS"; then you can access the Sage notebook from the "host OS" by pointing its web browser to http://localhost:X 
20141212 16:08:10 0500  commented answer  Calculation of symbolic eigenvalues in your link it works because the matrix is 3x3. Generally speaking, for matrices bigger than 4x4 it will fail, due to impossibility to have a general formula for roots of polynomials of degree bigger than 4. 
20141212 07:54:40 0500  answered a question  Integral not being computed correctly you can certainly compare the numeric outputs for constants: in maxima you do and you get 0.729009112317963  13.831305954985441e9 %i, while the Mathematica's constant term is is 0.9958449670166816. So it's really different answers, and probably Maxima is wrong, as the imaginary term looks suspiciously large. The only way to find out for sure is to compute this by some other means... 