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 -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at https://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/d/optout.
