Numpy doesn’t quite get it. It covers the core verbs, but it opts for specialised names instead of using adverbs (you can apply your own, but it’s much more laborious).

Once you see +/, you understand ,/ or fn/ - whereas you have to remember that it’s written sum, concatenate, or np.ufunc.accumulate in numpy. The same goes for +\ vs cumsum etc (and you don’t get all of these pre defined).

The difference here means that whilst numpy gets the core array operations down, it’s much less convenient and less self explanatory than the apl system.