> I think the problem, at least in CoCalc, is that @interact expects every argument to the function to be an interactive device. That may well be the problem in sagemath 8.1 too. I know that Andrey had pushed some changes so this works in Sage cell (and it does on the site linked to) and it should still in sagenb - matrices and vectors are shortcuts for a certain type of array interact. So yes, the argument should be interactive, but it is recognized as such. Unsure why that wouldn't work for you, perhaps Jupyter didn't have that widget ported or something.
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