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

*To*: mathgroup at smc.vnet.net*Subject*: [mg15971] Re: Plot[] problem (plnr) - help !!!*From*: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>*Date*: Fri, 19 Feb 1999 03:26:56 -0500*Organization*: Universitaet Leipzig*References*: <7ag3bt$aj1@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

Hi, look to the difference of SetDelayed[] (sort :=) and Equal[] (short ==) Hope that helps Jens Alexander Sirotkin wrote: > > Hi. > > I'm trying to do most trivial and simple thing - define > some function and then Plot[] it. However, I get some very > weird error - " ...is not a machine-size real number at ..." > > Here is the code : > a[0]==1 > a[1]==0.99/50000 > H[w] == 20Log[10,Sum[a[k] Exp[I 2Pi w(-k)], {k,0,1}]] > Clear[H] > Plot[H[w], {w, 1, 100}] > > I've seen some articles (even at www.wolfram.com) about that > problem, but NONE of them proposed a working solution !!! > > Just putting Evaluate[] inside the Plot[] does nothing...