Re: Summation in Mathematica

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• Subject: [mg130608] Re: Summation in Mathematica
• From: debguy <johnandsara2 at cox.net>
• Date: Thu, 25 Apr 2013 02:56:04 -0400 (EDT)
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• References: <kl8e4n\$on7\$1@smc.vnet.net>

```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

```

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