Wed 2018-03-28 12:27:32 UTC, Simon King:
>
> Hi!
>
> A colleague told me that when grading linear algebra exams (thus, when
> he needs to input many matrices to find out where exactly the students
> made miscalculations), he prefers to work with Mathematica.
>
> The reason he gave: In Mathematica, matrices can be defined with a
> graphical tool. Hence, one can input some entries, use arrow keys to
> switch from entry to entry, and can insert (and delete?) rows or columns
> on the fly.
>
> I think it would be nice for SageMath to have such function, too. Both
> in the notebook and on command line, actually.
>
> I found on
>
https://stackoverflow.com/questions/18985260/gui-to-input-and-output-matrices
> that one can use tkinter to create such a tool. But alas, even the first
> line fails:
>
> sage: import tkinter as tk
> ...
> /home/king/Sage/git/sage/local/lib/python2.7/lib-tk/Tkinter.py in
<module>()
> 37 # Attempt to configure Tcl/Tk without requiring PATH
> 38 import FixTk
> ---> 39 import _tkinter # If this fails your Python may not be configured
for Tk
> 40 tkinter = _tkinter # b/w compat for export
> 41 TclError = _tkinter.TclError
>
> ImportError: No module named _tkinter
>
> I would imagine a function, say, easy_matrix, such that easy_matrix()
> starts with an empty matrix (the ring given by the later inserted
> entries), easy_matrix(R) specifies the ring R, easy_matrix(m,n) starts
> with the specified number of rows and columns, and easy_matrix(M) allows
> to interactively edit a previously defined matrix M.
>
> I have no experience with the creation of graphical tools, but would
> appreciate someone to step up and create it. I think it would be nice
> for both casual and more experienced users.
>
> Best regards,
> Simon
When you build Sage from Source, Python will be built with tk support
if the prerequisites are installed in your system.
In Ubuntu, do
sudo apt install tk tk-dev
before building SageMath.
If you have already built SageMath, then after
sudo apt install tk tk-dev
you want to do
sage -f python2
afterwards, to recompile the Python in your Sage with tk support.
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