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MathGroup Archive 2007

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Re: Plot, Epilog, and Text

  • To: mathgroup at smc.vnet.net
  • Subject: [mg80814] Re: Plot, Epilog, and Text
  • From: Szabolcs <szhorvat at gmail.com>
  • Date: Mon, 3 Sep 2007 06:08:29 -0400 (EDT)
  • Organization: University of Bergen
  • References: <fbdmo6$pat$1@smc.twtelecom.net>

Bruce Colletti wrote:
> Re 6.0.1 under WinXP.
>  
> Why does the first Plot fail but not the second?  
> 
> They seem equivalent:  the former simply uses a function to implement the Text command that is explicit in the second Plot.
> 
> Thankx.
> 
> Bruce
> 
> f=PDF[NormalDistribution[3,Sqrt[6]],x];
> g[X_String,w_Real,f_]:=Text[Style[X,12,Bold],{w,f/.{x->w}},{0,-2}];
> 
> Clear@x;
> Plot[f,{x,-40,40},PlotRange->All,Epilog->{g["X",3,f]}]
> 
> Plot[f,{x,-40,40},PlotRange->All,Epilog->{Text[Style["X",12,Bold],{3,f/.{x->3}}]}]

3 is not a Real, but an Integer, so g["X",3,f] does not match 
g[X_String, w_Real, f_].  Just use g[x_String, w_?NumericQ, f_] in the 
function definition.

Szabolcs


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