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A key feature for me would be that it remains runnable in the browser.

Gauss (https://github.com/wayoutmind/gauss) has some nice features in this space. But only has vectors at the moment.

It would be cool to have an all JS implementation of NumPy or SciPy but the reality of the situation is that if this is going to be used in a research setting and speed is one of the most important factors, then this is secondary to actually porting over the lower level C++ and FORTRAN code.

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