Re: problem with Sum
- To: mathgroup at smc.vnet.net
- Subject: [mg100671] Re: problem with Sum
- From: dh <dh at metrohm.com>
- Date: Wed, 10 Jun 2009 17:12:39 -0400 (EDT)
- References: <h0nugr$b72$1@smc.vnet.net>
Hi,
try e.g.:
Sum[a[k], {k, Min[i + j - n, j] + 1, Max[i + j - n, j]}]
Daniel
olfa wrote:
> Hi mathematica community,
>
> I have this input: Sum[a[k], {k, 1, j}] - Sum[a[k], {k, 1, i+j-n}]
> How it is possible to let mathematica gives as output:
> Sum[a[k], {k, i+j-n+1, j}] if i+j-n<j
> and Sum[a[k], {k, j+1, i+j-n}] if i+j-n>j
>
> thank you very much.
>