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 ...
> ==========================================================================