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MathGroup Archive 2006

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Re: x/x

  • To: mathgroup at smc.vnet.net
  • Subject: [mg66712] Re: x/x
  • From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
  • Date: Sat, 27 May 2006 21:03:12 -0400 (EDT)
  • Organization: The Open University, Milton Keynes, UK
  • References: <e593im$3ju$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Sinan Kapçak wrote:
> I plot the function f(x)=x/x in mathematica but I do not get the graph what i expect. Is this problem something about plot options?
> 
Hi Sinan,

Knowing neither what you got nor what you expected, I still hope that 
the following lines will be helpful:

In[1]:=
Clear[f]
f[x] = x/x

Out[2]=
1

In[3]:=
(* Error messages and empty graph *)
Plot[f[x], {x, -2, 2}];

In[5]:=
(* A straight line *)
Plot[1, {x, -2, 2}];

In[7]:=
Clear[f]
f[x_] = 1
(* A straight line *)
Plot[f[x], {x, -2, 2}];

Out[8]=
1

In[11]:=
Clear[f]
f[x_] := 1
(* A straight line *)
Plot[f[x], {x, -2, 2}];

In[15]:=
Clear[f]
f[x_] := x/x
(* A jagged line *)
Plot[f[x], {x, -2, 2}];
(* A less jagged line *)
Plot[f[x], {x, -2, 2}, PlotPoints -> 50];
(* A straight line *)
Plot[Evaluate[f[x]], {x, -2, 2}];

Best regards,
Jean-Marc


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