       Re: Making plots using transformation rules

• To: mathgroup at smc.vnet.net
• Subject: [mg71942] Re: Making plots using transformation rules
• 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:

> 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, 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:=g[t_]:=D[t^2,t]
In:=f=g[x]
Out=2 x

In:=Plot[f,{x,0,2}];

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