What exactly did it have to do with graphing?
Inequalities?
Conics?

Try to explain what graphing program it is and what it does, even if it's kinda hard to explain. Just give us something more specific than graphing. 

If you're trying a Lua version of whatever it is, I could help. 

I know of a few ways to accomplish this.

Graphing stats: Have the program store the stats into two lists, and have the statistics page set up.

Graphing funcs: Have the program use define to define a y function, and have a graph page set up.

You can do regressions and then fetch the equation from the multi-string output to do one of the above, since that sounds sort of like what you're doing.

Oh, and this is in basic.

Graphing funcs: Have the program use define to define a y function, and have a graph page set up.

I also have had this question. How could I use "define" to set up a y function?

look for the define block in the second library page, the one separated into sections. That can be inserted in, or(I think this way is CAS only) I think you can just store an expression of undefined x variables into a y var that is set to show.

Also, matrix-based kite drawing can be approximated using lists and the graph viewer, since you can connect them with lines and those lines can go up, down, forward or backward. The line is traced through the list values, not in order of size.

ie:
{0,1,2,3} -> l1
{3,2,2,1} -> l2

set up would have a point at 0,3, one at 1,2, another at 2,2, and one at 3,1, with a line connecting them in that order. You can easily alter lists in basic, and this change will be reflected on the tables.

Unfortunately you can't use matrixes directly since the data table application doesn't let you use them. (How would you represent different number values, for example?)

I meant use it for plotting in the list/data app, not altering them or using them in general.

also, for altering them, if you store the appropriate size of list you only need row number.