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Reducing Table Run Time

I've got a question about the following bit of code:

eq2=Exp[-I k x^2/(2 f)];

Whenever i run this for a value of N necessary to generate a table of
2000+ values, the line to generate table f1 seems to take up a good 80-90% of
the running time, which I understand is due to the evaluation of the function.
My question involves whether or not there is a way to reduce the running
time, or is this something we have to live with?  For 2048 samples, I clocked
it at approximately 44s, with most of it taken up by the table.  Thanks in

J.T. Tsai

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