       Re: Plot and evaluate help

• To: mathgroup at smc.vnet.net
• Subject: [mg7881] Re: Plot and evaluate help
• From: dreece at atl.mindspring.com (Daryl Reece)
• Date: Thu, 17 Jul 1997 15:35:44 -0400
• Organization: MindSpring Enterprises, Inc.
• Sender: owner-wri-mathgroup at wolfram.com

```If you are trying to plot a function of more than 1 variable, then
Plot3D[f[x,y], {x,x0,x1}, {y,y0,y1}] is what you need.  Remember that
f[x_] means a function with head f and argument x.  If it is truly a
two variable function, it would be better to write f[x1_,x2_]:=...

If you are merely trying to plot a 1 variable function that has two
parameters fed to it,

Plot[f[x]/.{c1->5, c2->3}, {x,min,max}] will do the trick.

c1 is assigned the value 5 and c2 is 3.  These values would have to be
altered to suit the specific problem.

akessler at ucla.edu (Alan E. Kessler) wrote:

>Hello,
>
>       I am a novice mathematica user having difficulty plotting a simple
>function.  I am trying to plot the functions f[x_] = c1 / (c1 + c2) and f'[x_]
>over an arbitrary range for c1 and c2.  The Plot syntax specifies Plot[f, {x,
>min, max}].  I hate to ask such a basic question, but how does one plot a
>function of more than one variable?

>Many thanks,

>Alan Kessler
>UCLA Dept. of Political Science

```

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