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Re: something wrong with my code??

  • To: mathgroup at smc.vnet.net
  • Subject: [mg129585] Re: something wrong with my code??
  • From: Alexei Boulbitch <Alexei.Boulbitch at iee.lu>
  • Date: Sat, 26 Jan 2013 01:40:56 -0500 (EST)
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First of all, this might give seasoned Mathematica users some serious
 eye sores cause I'm a newb at this xD

f[x_] := (1^-9) (Exp[38.629 x] - 1);
data = Table[if[[f[x], {x, -5, 5, 0.01}] > 0.005, 0.005, f[x]]];
ListPlot [data, DataRange -> {-5, 5}, Joined -> True,
 PlotRange -> {0, 0.01}, PlotStyle -> {Thickness[0.005]}]


What I want to do this is do a plot of a sweep from -5 to 5 with 0.01
 stepsize, and if the output value exceeds 0.005, the output value will
 just be 0.005. It will kind of look like a heavyside step function/unit
 step function.
Any help would be greatly appreciated xD.


Hi,
Try this, it is probably what you had in mind:

f[x_] := 10^-9*(Exp[38.629 x] - 1);
data = Table[
   If[f[x] > 0.005, {x, 0.005}, {x, f[x]}], {x, -5, 5, 0.01}];

ListPlot[data, PlotRange -> {0, 0.01},
 PlotStyle -> {Red, PointSize[0.005]}]

However, the problem is more simple that that. Try this:

f2[x_] :=
  If[10^-9*(Exp[38.629 x] - 1) > 0.005, 0.005,
   10^-9*(Exp[38.629 x] - 1)];
Plot[f2[x], {x, -5, 5}]

Your code contains syntax errors. I advise you to have a look into the Math=
ematica basics, it pays off.

Have fun, Alexei




Alexei BOULBITCH, Dr., habil.
IEE S.A.
ZAE Weiergewan,
11, rue Edmond Reuter,
L-5326 Contern, LUXEMBOURG

Office phone :  +352-2454-2566
Office fax:       +352-2454-3566
mobile phone:  +49 151 52 40 66 44

e-mail: alexei.boulbitch at iee.lu






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