Comment:
Chris
Summary:
In this paper, the author describes the MathPad, a math algebra editing system, aims to provide easy use for users. The user can wrote the math equation on the screen and the system can automatically recognize the equation and solve them. The author also developed several useful gestures to edit or command the math equation that already wrote, including delete, scribble, tap, and etc. Besides recognize and solve the foundamental math equations for us, the system can also handle the matrix, including adding, multiplication, reverse,etc. And the system can also plot the funcion in the screen by using simple gesture. In all, Mathpad is very nice, and the best algebra editing system among all the sketch-based math system.
Discussion:
In fact, I read the paper long time ago. The system is very beautiful, and most of all, it is not easy to design and implement all these functionalities in one system. There are many difficulties when designing such system. The individual character recogniton is the first problem we should conquer, which itself is very hard problem. If the character set is large, the recogniton for individual character becomes very hard. In order to recognize the whole formula, the system needs formula parser, however, the parser need to handle with many difficulties and ambiguities in the math equaiton, like lower case, upper case, and etc. In all, Mathpad is awsome, but I still doubt about its accuracy, it should be not high if user does not draw carefully.
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