RE: Plotting multiple functions using Map

*To*: mathgroup at smc.vnet.net*Subject*: [mg24302] RE: [mg24254] Plotting multiple functions using Map*From*: "David Park" <djmp at earthlink.net>*Date*: Fri, 7 Jul 2000 00:11:44 -0400 (EDT)*Sender*: owner-wri-mathgroup at wolfram.com

> -----Original Message----- > From: Grischa Stegemann [mailto:Stegemann at Physik.TU-Berlin.DE] To: mathgroup at smc.vnet.net > Dear group > > I have a two parameter function, e.g. > In[1]:= f[x_,y_]:=x+y > > Now I would like to plot f[x,y1],f[x,y2],... within the same chart. > Usually you would try something like this: > In[2]:= Plot[{f[x,1],f[x,2],f[x,3]},{x,-3,3}] > > Since my list of y's is pretty long I tried this: > In[3]:= ylist={1,2,3}; > Plot[Map[f[x,#1]&,ylist],{x,-3,3}] > > but Mathematica complains > Plot::"plnr": (f[x, #1]&)/@ylist is not a machine-size real number > at x=-2.9999997 > Grischa, You idea is right on the mark. You only forgot that Plot has the attributes HoldAll, so you need to Evaluate to obtain the desired list of functions. Plot[Evaluate[Map[f[x, #1] &, ylist]], {x, -3, 3}]; David Park djmp at earthlink.net http://home.earthlink.net/~djmp/