Robert:
> Going back a few messages here -- bear in mind that even if
> a matrix has just one column, you must still index it with
> two indices. C[1] etc are lists of one element, C[1, 1] etc
> are the elements themselves.
>
> When I put C[1, 1], C[2, 1], C[3, 1] in the plot2d
> expression shown above, I get a smooth curve and a jaggy
> line. I guess isolated points are intended, not sure why they're
> being connected, but at least I got some plot output.
Indeed! That was the problem all along. Thanks for pointing it out.
Rich and Volker, thanks for your help, too.
Rich