Re: Making plots using transformation rules

*To*: mathgroup at smc.vnet.net*Subject*: [mg71992] Re: Making plots using transformation rules*From*: Helen Read <hpr at together.net>*Date*: Thu, 7 Dec 2006 06:25:53 -0500 (EST)*Organization*: EarthLink Inc. -- http://www.EarthLink.net*References*: <el3klk$rmr$1@smc.vnet.net>

David Park wrote: > >> From: amannuc at yahoo.com [mailto:amannuc at yahoo.com] >> >> 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. >> > Why do you use a SetDelayed instead of a simple Set? > > g[t_] = D[t^2, t] > 2 t > > Plot[g[t], {t, 0, 10}]; Or even more simply, g[t_]=t^2 Plot[g'[t],{t,0,10}] -- Helen Read University of Vermont