Matplotlib.pyplot.hist() very slow

Question

I\'m plotting about 10,000 items in an array. They are of around 1,000 unique values.

The plotting has been running half an hour now. I made sure rest of the code wo

Answer 1

For me it took calling figure.canvas.draw() after the call to hist to update immediately, i.e. hist was actually fast (discovered that after timing it), but there was a delay of a few seconds before figure was updated. I was calling hist inside a matplotlib callback in a jupyter lab cell (qt5 backend).

Answer 2

Anyone running into the issue I had - (which is totally my bad :) )

If you're dealing with numbers, make sure when reading from CSV that your datatype is int/float, and not string.

values_arr = .... .flatten().astype('float')