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Re: Plotting a series of piecewise functions

  • To: mathgroup at
  • Subject: [mg88955] Re: Plotting a series of piecewise functions
  • From: Jens-Peer Kuska <kuska at>
  • Date: Thu, 22 May 2008 02:36:45 -0400 (EDT)
  • Organization: Uni Leipzig
  • References: <g11r06$a7i$>
  • Reply-to: kuska at


you can plot it when you find out that xo is different from x0
because o is a letter and 0 is a digit


when you define

f[lambda_, xo_, x_] :=
  Piecewise[{{lambda*Exp[-lambda*(x - xo)], x > xo}}, 0]


Claus wrote:
> Hi,
> I want to plot a series of functions. Namely I want to plot a series of 
> 2-parametric exponential distribution functions. By series I mean the 
> graphs for various xo values on one plot.
> So,
> the function looks like this:
> f[lambda_, xo_, x_]:=lambda*Exp[-lambda*(x-xo)]
> Now I can plot this (wrongly) with
> Plot[Evaluate[Table[f[lambda,xo,x],{lambda,0.5,0.5},{x0,4}]],{x,0,10}]
> The problem is that, really, f should be zero for x<xo.
> I can plot one graph (for xo=1 and lambda=1) like this:
> Plot[Piecewise[{{f[0.5,1,x],x>1},{0,x<1}}],{x,0,10}]
> Now, how could I plot a series of plots (for different xo) on one chart 
> similarly to the Piecwise approach (can I do it with Piecewise at all, 
> or do I need an If clause of sorts)?
> Thank you for your help,
> Claus

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