Re: HELP: Plot[]ing composite functions

*To*: mathgroup at smc.vnet.net*Subject*: [mg16007] Re: HELP: Plot[]ing composite functions*From*: Paul Abbott <paul at physics.uwa.edu.au>*Date*: Sat, 20 Feb 1999 02:52:01 -0500*Organization*: University of Western Australia*References*: <7ag4kt$b0q@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

Alexander Sirotkin wrote: > Simple question - after definition of a functions > which looks like this "H[w] == Log[10, 1 + Exp[I2Pi w]]" > I try to Plot[] it and get the "... not machine size real > number at ..." error. Because you are trying to plot a complex-valued function. Try H[w_] = Log[10, 1 + E^(I*2*Pi*w)]; Plot[Abs[H[w]], {w, 0, 4}]; or, more efficiently, Plot[Evaluate[Abs[H[w]]], {w, 0, 4}]; Cheers, Paul ____________________________________________________________________ Paul Abbott Phone: +61-8-9380-2734 Department of Physics Fax: +61-8-9380-1014 The University of Western Australia Nedlands WA 6907 mailto:paul at physics.uwa.edu.au AUSTRALIA http://www.physics.uwa.edu.au/~paul God IS a weakly left-handed dice player ____________________________________________________________________