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2018-10-11 16:30:33 +0100 asked a question jupyter notebook multi users ?


I used to use notebook sagenb for teaching purposes. Each student had a login and password to work on the same server. I ran into several internal server errors 500 using it. so I though since it seems that jupyter notebook is more recommended I should try and switch to it. However, I am concerned because I am not sure it allows the same type of multi-users server. Hint from jupyter notebook login page that points to https://jupyter-notebook.readthedocs.... tell me that it might not. So the questions are:

1/ with "sage -n jupyter --ip='*'" is it possible to have 16 or so students connecting to the same server and working on similar worksheets (as it seemed to work rather smoothly for sagenb)?

2/ if not, is there another way to have sage use jupyter notebook for multi users?

3/ if not, is an install of jupyterhub or sagemathcloud reasonnable with no particular sysadmin skill?

4/ if not is there anything else I should try?

5/ if not, do some of you have experience of sagenb under sage 8.3 usability?

Installing sagemath on all computers is not an option for me at the moment.

Best regards,

b PS : my sagemath on a debian 9 server compiled from source (I used to use debian packages but though it might work more smoothly with install from source)

2018-01-30 09:50:01 +0100 commented answer notebook admin not working

Thank you. It does help. I'll try and file a bug report. I started a class with sagenb worksheet for student to use and complete. I am not sure whether I'll be able to switch to jupyter now not knowning wether I can produce the same kind of worksheets. I'll bear your advice in mind though at least for future use. Thanks again.

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2018-01-29 18:37:30 +0100 asked a question notebook admin not working


I have installed sagemath on debian (Stretch) with the debian package on 3 different computers. When clicking on manage users 500: internal server error and raise BuildError(endpoint, values, method, self) BuildError: Could not build url for endpoint 'users' with values ['reset']. Did you mean 'admin.users' instead?

I have no clue how to fix this or what it is due to... maybe I need to configure notebook or use different options Any idea ?


b. edited added debian release 9

2014-10-06 12:55:27 +0100 commented question Why does JMOL fail here?

Sorry to post second comment. I tried export "_JAVA_OPTIONS= -server -Xmx2048m" (different variable from last time ???) I still got the warnings you described but got a picture with making it interactive jmol freezes... (unable to finish launching).

2014-10-06 10:42:38 +0100 commented question Why does JMOL fail here?

I got the same kind of errors for a different kind of plot. The code is messy and uninteresting. Only my text file is not empty: Viewer handling error condition: java.lang.OutOfMemoryError GC overhead limit exceeded. (Note that this file is on the server.) Which led me to think either the file or the computations involed were too big. I tired export "_JAVA_OPTS= -server -Xmx1024m" (still on the server) to grant more memory to java It did work once but I do not know if it is reproducible (might just be chance) jmol saving view failed to save all the objects (or redisplay them on my machine anyway) I can reproce your error. making interactive displays a partial picture (not the whole cube) (I am very new to all this so my guesses are likely unaccurate.)

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2014-10-04 12:23:57 +0100 answered a question qwerty to azerty


I think wiki.sagemath has what no need. You can log into the virtual machine from the text-mode console.


Press Right-Ctrl and F1 for a different tty. The user account running the Sage notebook server is called sage with password sage. The root account password is sage, too. Then do

sudo loadkeys azerty

to make it permanent edit /etc/sysconfig/keyboard as described in the detailed answer here (Section 8.1.2)

Best regards,


2014-10-04 11:36:58 +0100 asked a question save (and reuse) parametric_plot3d object


I am a total newbie in Sage and I do not talk Python :-( I was just trying to draw some surfaces for illustration when I came across a problem loading my saved computations.

NotImplementedError: You must override the get_grid method. (code below.)

Is there a way to do what is suggested (override...)?
I found a bug ticket and saw

I am not very hopeful, but since I basically do not understand what's written, maybe there's a way to override get-grid as the error message says. Is there?

If not, is there a way to convert to an object that can be saved (and at least displayed again) or export it to an external format?

Thank you,



sage: pam2=load(DATA+'pam2imt5000.sobj') sage: type(pam2) <html><script type="math/tex">\newcommand{\Bold}[1]{\mathbf{#1}}\verb|<type|\phantom{\verb!x!}\verb|'sage.plot.plot3d.parametric_surface.parametricsurface'>|</script></html> sage: show(pam2) Traceback (most recent call last): ... NotImplementedError: You must override the get_grid method. sage: load(DATA+'pam3imt5000.sobj') Traceback (most recent call last): ... NotImplementedError: You must override the get_grid method.