Odd behavior (bug?) with Exp[-x^2} and Erf
- To: mathgroup at smc.vnet.net
- Subject: [mg42929] Odd behavior (bug?) with Exp[-x^2} and Erf
- From: AES/newspost <siegman at stanford.edu>
- Date: Mon, 4 Aug 2003 00:45:58 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
Very reluctant to claim I've found a bug in Mathematica, but the
following cells certainly aren't doing what I expect them to:
In[97]:=
x; Remove["Global`*"]
In[98]:=
f[x_] = (Exp[-5(x + 1)^2] + Exp[-5x^2] + Exp[-5(x - 1)^2])^2
In[99]:=
Plot[f[x], {x, 0, 2}, PlotRange -> {{0, 2}, {0, 2}}];
In[100]:=
g[y_] = Integrate[f[x], {x, 0, y}, Assumptions -> y > 0]
In[101]:=
Plot[g[y], {y, 0.001, 2}, PlotRange -> {{0, 2}, {0, 1}}];
(Mathematica 4.2.0.0, Mac iBook, OS 9.2)