d0mo@dtek.chalmers.se (Mats Olsson) (03/14/91)
Hi folks! I have a little thought. As you know, the HP48 has some abstract data types built-in, called "Long Real", "External", etc (I bet it IS an "Internal" as well!). (They all have hidden structures and are therefore represented as their names on the stack (=> abstract)) Now the idea: How about to create an *own* one, for example a "Symbolic Matrix" data type. It should then be shown on the stack as just the string "Symbolic Matrix", but when you pushed the down-arryw key, you would be able to look at, and edit, the symbolic matrix in a matrix editor. (This implies of course that one has redifined the down- arrow key, to check for that kind of data type, and also that you've written a symolic-matrix editor) I think it really *is* need for a symbolic matrix data type, and wouldn't it be nice if it could be made in that "professional" way? Then one could add operators, such as *,+,1/x,det etc, and also some selectors (to get an object at a specific position of the matrix, etc), to work on that data type... How about it? Is it possible? I welcome any comments!! Regards, Mats Olsson, Chalmers Univerity of Technology, Sweden