I’ve been on fever for several days now, when I’m writing this. Nevertheless, now Calculus is at version 3.2.0 beta. Finally saving to Pictures folder work properly — also in later (>=6) Android versions.
One new feature is also possibility to make y limits equal to x limits With this button one can get results like this:
The video below is recorder directly from my phones screen:
Let’s see if I manage to implement some new features to Calculus in near future.