[Date Index]
[Thread Index]
[Author Index]
Re: beginner plot function with parameter
*To*: mathgroup at smc.vnet.net
*Subject*: [mg74041] Re: beginner plot function with parameter
*From*: Bill Rowe <readnewsciv at sbcglobal.net>
*Date*: Wed, 7 Mar 2007 03:12:30 -0500 (EST)
On 3/6/07 at 5:30 AM, wei_li92 at hotmail.com (Wei Li) wrote:
>I am using mathematica 5 to plot a function with some parameter, I
>want to plot for example a simple parabolic function with positive
>parameter s:
>f[z_]:=(z/s)^2; Plot[f[z],{z,-s,s}];
This code cannot create a plot unless s has been previously set
to a numeric value.
That is doing:
s=3;
f[z_]:=(z/s)^2;
Plot[f[z],{z,-s,s}];
Should generate a plot for you.
Note, it is generally not a good idea to make the result of a
function dependent on a global variable assigned elsewhere.
Inevitably, particularly in large notebooks, this leads to
unexpected results and can be quite time consuming to locate why
those results occurred.
A better way to write f that avoids this problem would be
f[z_,s_]:=(x/s)^2
Or if you simply wanted to create several different plots you
could do the following:
f[s_]:=
Block[{z}, Plot[(z/s)^2, {z, -s, s}]]
With this definition you could easily generate a family of
parabolas as follows:
Show[
Block[{$DisplayFunction=Identity}, f/@Range[3]]];
--
To reply via email subtract one hundred and four
Prev by Date:
**analytic integration of InterpolatingFunction compositions**
Next by Date:
**Re: Transformation rules - explain please**
Previous by thread:
**Re: beginner plot function with parameter**
Next by thread:
**Re: beginner plot function with parameter**
| |