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Re: Summation w/ Functions

  • To: mathgroup at
  • Subject: [mg43403] Re: Summation w/ Functions
  • From: Dr Bob <drbob at>
  • Date: Tue, 16 Sep 2003 04:35:55 -0400 (EDT)
  • References: <>
  • Reply-to: drbob at
  • Sender: owner-wri-mathgroup at

If Wave is a 2-dimensional matrix, Wave[[j,0]] is the wrong notation -- the 
0-th element of the j-th row will be the head List, and I don't think you 
mean to integrate List over x!

Anyway, it's j that Mathematica is complaining about, before getting to 
that issue.

Simplifying things a little, this works:

wave = Range[10];
Sum[ConstantCalc[someVars, j, someMoreVars]*wave[[j]], {j, 1, 10}]

But this doesn't:

wave = Range[10];
Sum[ConstantCalc[someVars, j, someMoreVars]*wave[[j]], {j, 1, n}]

That makes a certain amount of sense, since the second form is undefined if 
n > 10, for instance.  But then the Sum should return unevaluated.  The 
error messages make no sense at all.


On Wed, 27 Aug 2003 04:05:09 -0400 (EDT), Musaddiq Awan 
<reallymadsquid at> wrote:

> I am basically trying to sum something while calling a function of it.
> Mathematica is giving me the error that IntegerPart[j] is not an
> integer. This is the general idea of my command. (ConstantCalc is a
> function)
> Sum[ConstantCalc[someVars,j,someMoreVars]*Integral[Wave[[j,0]],{x,- 
> Infinity,Infinity}],{j,1,n}]

majort at
Bobby R. Treat

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