The Difference Between Digital and Analogue Computers

Digital computation and analogue computation are two separate types of computation invented at different times for different machines. Sometmes analogue computers use discreet values, and when they do they do not. And they did not suddenly become digital computers. We represent numbers via their digits, which is just an ordered string of individual numerals. In this case, we represent a number by its magnitude, using some physical quantity. This is the essence of analogue representation. As christopher peacock puts it, analogue representation is representation of magnitudes by magnitudes.