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Re: Making plots using transformation rules
*To*: mathgroup at smc.vnet.net
*Subject*: [mg71942] Re: Making plots using transformation rules
*From*: Bill Rowe <readnewscix at earthlink.net.invalid>
*Date*: Tue, 5 Dec 2006 06:04:40 -0500 (EST)
*References*: <el128e$5h8$1@smc.vnet.net>
In article <el128e$5h8$1 at smc.vnet.net>, amannuc at yahoo.com wrote:
> I've read about making plots of functions, for example:
> Plot[Evaluate[f[x]], {x, 0, 10}]
> I don't have this sort of function to plot. Because it involves
> derivatives, I only get numerical output after defining a
> transformation rule. A simple example (not the real one) is the
> following:
> g[t_] := D[t^2, t]
> g[t] /. t -> 1
> I cannot evaluate g[1], because then Mathematica thinks I am trying to
> take a derivative with respect to the number 1, and flags that as
> error. So I need the transformation rule to get function values.
> What is the best way to plot g[t]?
Probably the simplest way to do what you want would be to symbolically
evaluate g[t] and plot the resulting expression, i.e.,
In[1]:=g[t_]:=D[t^2,t]
In[2]:=f=g[x]
Out[2]=2 x
In[3]:=Plot[f,{x,0,2}];
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