On Wed, 2011-02-23 at 10:56 -0500, Doug Stewart wrote:
> I tried: plot2d(difar[x],[x,1,200]); plot2d: expression evaluates to
> non-numeric value somewhere in plotting range.
The form plot2d(difar[x], [x,1,200]);
would only work if difar[x] existed for any value of x between 1 and
200, for instance difar[2.345409689].
To make a plot with points, look at the examples of plot2d with the
"discrete" option in the manual (? plot2d).
Regards,
Jaime