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Topic: Summation in Mathematica
Replies: 2   Last Post: Apr 26, 2013 4:24 AM

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 debguy Posts: 33 Registered: 4/11/13
Re: Summation in Mathematica
Posted: Apr 25, 2013 2:52 AM
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UnderoverscriptBox[\(\[Sum]\), \(m = \(-10\)\),
\(10\)]\(\(eigenfunctionsort[n, j]\)[\([m + 11]\)]
Exp[I*2*\[Pi]*m*x/dp]\)\),{j,1,21}] // DisplayForm

does not work on my mm v. 4.0 and I'm unsure what's missing. a table
or another Sum involving j maybe? I'm getting a \(\) not paired error
and missing [.

but as I see it

fun[[m+11]]

necessarily means to take a Part of eigenfunctionsort[n, j] ; which
isn't obviously a number, list, or symbol from where I sit.

Ben Blomberg wrote:
> Hello All,
>
> I am trying to understand a piece of code I found but I am stuck on this
> summation. This is part of a larger do loop over n.
>
> UnderoverscriptBox[\(\[Sum]\), \(m = \(-10\)\),
> \(10\)]\(\(eigenfunctionsort[n, j]\)[\([m + 11]\)]
> Exp[I*2*\[Pi]*m*x/dp]\)\),{j,1,21}]
>
> What I mainly do not understand is what is happening with the [m+11]. Is
> that being multiplied with eigen function sort with each step in the sum,
> or is that simply adding 11 to m at each step in the sum?
>
> Thanks Ben

Date Subject Author
4/24/13 Ben Blomberg
4/25/13 debguy
4/26/13 Roland Franzius

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