Question: Maple hangs / freezes when computing a double exponential smooting model

Hello! I am trying to create a double exponential smoothing model by optimizing the parameters a and b. The model is quite big and Maples needs a very long computation time. Can anyone help me on this one? I'll attach my file: View 9101_double_exponential_smoothing.mw on MapleNet or Download 9101_double_exponential_smoothing.mw
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How do I prevent Maple from crashing?I use Maple 10 with windows XP and Maple 11 with Linux.

Thanks for your help :)

Seagull

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