Trouble : simple stuffs for beginner

• To: mathgroup at smc.vnet.net
• Subject: [mg48249] Trouble : simple stuffs for beginner
• From: Julien MARY <julien.mary at free.fr>
• Date: Wed, 19 May 2004 02:42:38 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

```	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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