Thanks for your help.  Is there any way to get the LINEST function to work
iteratively with a macro.  I am writing an optimization spreadsheet that
finds the minimum of a function over a range using successive parabolic fits
to three data points along the range.  A curve is fitted to the three data
points (x(k-2), x(k-1), and x(k)) and the minimum of the curve is then found.
That minimum then becomes the new x(k) and the process is repeated until a
certain level of convergence is found.  I want to be able to do this with a
single macro command.

I would be grateful for any suggestions.