On Wednesday, March 28, 2018 at 9:20:17 AM UTC-4, Jeroen Demeyer wrote:
>
> On 2018-03-28 15:05, Simon King wrote: 
> > By "graphical", I really mean "interactively". 
>
> It seems to me that those would be two different things: 
>
> (1) A notebook widget for inputting matrices 
>
>
This already exists, at least for a given size mxn - and in Sage cell or 
CoCalc, one can dynamically allocate that:

http://sagecell.sagemath.org/?z=eJxzyMwrSS1KTC7h5UpJTVOI18i1Nda04uVSAAIHhByIC5HPszWByWNRg1Dnq2CrkJtYUpRZoZGrk6eJrAcEijPyyzV8NQE0yR9W&lang=sage

@interact
def _(m=3):
    @interact
    def _(n=4):
        @interact
        def _(M = matrix(m,n)):
            show(M)

I nearly always make an interact to grade linear algebra exams for this 
reason.

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