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Plot[] problem (plnr) - help !!!


I'm trying to do most trivial and simple thing - define 
some function and then Plot[] it. However, I get some very
weird error - " not a machine-size real number at ..."

Here is the code :
H[w] == 20Log[10,Sum[a[k] Exp[I 2Pi w(-k)], {k,0,1}]]
Plot[H[w], {w, 1, 100}]

I've seen some articles (even at about that
problem, but NONE of them proposed a working solution !!!

Just putting Evaluate[] inside the Plot[] does nothing...

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