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MathGroup Archive 2007

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Re: Array reference help please

  • To: mathgroup at smc.vnet.net
  • Subject: [mg73337] Re: Array reference help please
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Tue, 13 Feb 2007 06:53:47 -0500 (EST)
  • Organization: Uni Leipzig
  • References: <eqjiid$7te$1@smc.vnet.net>
  • Reply-to: kuska at informatik.uni-leipzig.de

Hi,

and something like

Plot[Evaluate[
   #[[1]]*UnitStep[t-#[[2]]]*Exp[-lambda*(t-#[[2]])] & /@ data
],{t,0,1}]

does not help ??

Regards
   Jens

rob wrote:
> I've managed to get this code working but I'm stumped on a
> good way to refer to the entries in the data when plotting.
> The only thing I can get to work is to refer to the first of
> each pair as Part[data[[i]],1] and the second as
> Part[data[[i]],2].
>
> And more humiliating, the second one I have to spell out
> twice. I tried all kinds of substitutions but failed. I know
> you gurus here know how to make this code look better and
> run more quickly. Thanks for your time.
>
>
>
> =CE=B1=100;(* decay parameter*)
>
> (* first parameter is pulse amplitude, second is time of
> occurrence - later to follow Poisson *)
>
> data=Table[Random[],{40},{2}];
>
> li=Length[data];
>
> Plot[Sum[
>          Part[data[[i]],1]  UnitStep[t-Part[data[[i]],2]]
>          Exp[-=CE=B1 (t-Part[data[[i]],2])],  {i,li}
>          ]
>    ,{t,0,1}]
>


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