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 ... ==========================================================================