Productarray is useful for generating a regular or semiregular mesh given
the values that would label the axes of such a mesh if you did a normal 2-d
plot. The implication is that you would have a list of 10 X's and 8 Y's
that you wanted to form a 10x8 mesh. But you appear to have 80 [X,Y]
points, not a mesh, correct?

So you can use the Data Prompter to read in these 2 blocks of values, or
you can use the native format. To do the latter, declare a gridpositions
with origin 0, delta 1, count 80, and the two arrays as you have done
already, making each dep "positions". The field has:
component "positions" value 1
component "X" value 2
component "Y" value 3

Slurp it in, Mark("X"), and Mark("Y") in parallel, feed both to a
Compute([a,b]), then Unmark the output to "positions".

Chris Pelkie
Vice President/Scientific Visualization Producer
Conceptual Reality Presentations, Inc.
30 West Meadow Drive
Ithaca, NY 14850
[EMAIL PROTECTED]

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