RE: DiracDelta Function question
- To: mathgroup at smc.vnet.net
- Subject: [mg21129] RE: [mg21082] DiracDelta Function question
- From: "Ersek, Ted R" <ErsekTR at navair.navy.mil>
- Date: Fri, 17 Dec 1999 01:21:29 -0500 (EST)
- Sender: owner-wri-mathgroup at wolfram.com
Julian Francis wrote:
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Why is mathematica unable to evaluate:
Integrate[DiracDelta[2 x - 1], {x, -Infinity, Infinity}]
Also interestingly:
Integrate[DiracDelta[2 x - 2], {x, -Infinity, Infinity}]
returns (1/2). I should have thought that the answer in both cases would be
1.
I am using Mathematica v4.0 on MS Windows 95.
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It's obviously a bug. However, Mathematica 4.0 gets the next one right.
In[1]:=
Integrate[DiracDelta[2x - 1], {x, -10^6, 10^6}]
Out[1]=
1/2
Regards,
Ted Ersek
For Mathematica tips, tricks see
http://www.dot.net.au/~elisha/ersek/Tricks.html