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MathGroup Archive 2000

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Re: Plotting multiple functions using Map

  • To: mathgroup at smc.vnet.net
  • Subject: [mg24285] Re: [mg24254] Plotting multiple functions using Map
  • From: BobHanlon at aol.com
  • Date: Fri, 7 Jul 2000 00:11:27 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

In a message dated 7/5/2000 11:40:09 PM, Stegemann at Physik.TU-Berlin.DE writes:

>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
>
>On the other hand we have
>In[4]:= Map[f[x,#1]&,ylist]
>Out[4]= {1 + x, 2 + x, 3 + x}
>and
>In[5]:= Plot[{1 + x, 2 + x, 3 + x},{x,-3,3}] 
>of course works as expected.
>
>Where is my mistake?
>

Plot[Evaluate[Map[f[x, #1] &, ylist]], {x, -3, 3}];


Bob Hanlon


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