AndrewJust found `kalc`, a terminal based calculator that supports real-time output and graphing via `gnuplot`. What's lovely is you can configure `gnuplot` to draw directly to the terminal using its sixelgd mode (if your terminal emulator supports it).
I like the quick feed back for experimenting with different formula values and seeing the results in real-time.
GitHub - bgkillas/kalc: a complex numbers, 2d/3d graphing, arbitrary precision, vector/matrix, cli calculator with real-time output and support for units
a complex numbers, 2d/3d graphing, arbitrary precision, vector/matrix, cli calculator with real-time output and support for units - bgkillas/kalc