would like to program the x-y coordinate system.

Is there really is not to implement a general formula for the calculation of the window,

and this in a general function ?.

The intention is to have on this x -y axis the curve drawing which is generated with the

function eg the uc (t) and i (t) for charging a capacitor via a resistor or

another application.

I don't find any general formula for calculation the window.

It is not supposed to have to rewrite all my code but some parts where I stuck .

The problem is always that I never see a curve.

My question are:

1) Can here someone once in a general formula a function items for the calculation of the window range?

2) How do I draw the lines with the values of the x and y axis ?.

As x axis is time axis , and this is then divided into lines , and there are then placed on the values for the same y - axis

Refer to the figure of the x-y axis on the zero line

How can I charge and discharge current and capacitor voltage to graphically

visible as and curve. How should I calculate for that is always crashes .

Like a general formula to calculate the points .

Like using ddt statements. The user enters the parameters calculated

in the program and draws and i(t) and uc(t).