Plotatoe is a Java library for function plotting. You give the bot a function with some parameters and then it creates an image with the plot of that function for you. Everything is made from scratch.

You can test it here: https://telegram.me/plotatoemathsbot. It has three commands right now:

/plot f(x) start end step [options] // Normal plot

/results f(x) start end step        // Results in text

/projective f(x) start end step     // Plot in the projective plane

f(x) -> must be a function, with x as variable (i.e. 3*x). You can't put spaces in the function. The bot supports sum(+), substract(-), multiplication(*), division(/) and power function(^). It respects the natural order of operations but you can include parenthesis.

start -> can be any double.

end -> can be any number greater than start.

step -> can be any number greater than 0 and greater than end-start.

options -> are optional arguments you can add with a #.

#nolabel -> represents the function but without numbers (only start and end)

Thanks to rubenlagus for the TelegramBots library - TelegramBots

Thanks to MrCamoga for implementing the projective plane - MrCamoga