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MathGroup Archive 2004

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Re: Trouble : simple stuffs for beginner

  • To: mathgroup at smc.vnet.net
  • Subject: [mg48263] Re: Trouble : simple stuffs for beginner
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Thu, 20 May 2004 04:03:37 -0400 (EDT)
  • Organization: Universitaet Leipzig
  • References: <c8f236$d3l$1@smc.vnet.net>
  • Reply-to: kuska at informatik.uni-leipzig.de
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

what mean 

(-1)^k(2k - t)(2k - 1 < x <= 2k + 1)E[-(t - x)^2/2]

?? Multiply by a boolenan relation ??

I will not understand this and it has nothing to do with
Mathematica syntax .. can you explain what this is ??

Regards
  Jens

Julien MARY wrote:
> 
>         Hello,
> 
>    I am using Mathematica 4.0 with Linux Debian.
> 
>    I am defining :
> 
>         g[x_] := Sum[
>      Integrate[(-1)^k(2k - t)(2k - 1 < x <= 2k + 1)E[-(t - x)^2/2],
>        t], {k, -Infinity, Infinity}]
> 
> To be clear, it the convolution of  arcsin(sin(x))/2Pi with exp(-x²/2)
> 
>         The I want to plot g[x] with Plot[g[x],{x,-10,10}] and Mathematica is
> insulting me. Bug of Mathematica of Bug of my using of it ?
> 
>                 Julien
> ========================================================================
>         \!\(NSum::"nsnum" \(\(:\)\(\ \)\)
>      "Summand (or its derivative) \!\(\[Integral] \(\(\[LeftSkeleton] 1 \
> \[RightSkeleton]\)\)\) is not numerical at point \!\(k\) = \!\(46661\)."\)d1
> 
> General::"stop": "Further output of \!\(NSum :: \"nsnum\"\) will be \
> suppressed during this calculation."
> 
> Plot::"plnr": "\!\(g[x]\) is not a machine-size real number at \!\(x\) = \
> \!\(-9.999999166666667`\)."tpp
> 
> ....... etc ...
> ==========================================================================


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