Re: how to make Sum[n,{n,1,5}] to print 1+2+3+4+5? HoldForm?
- To: mathgroup at smc.vnet.net
- Subject: [mg79389] Re: how to make Sum[n,{n,1,5}] to print 1+2+3+4+5? HoldForm?
- From: Peter Breitfeld <phbrf at t-online.de>
- Date: Wed, 25 Jul 2007 06:07:41 -0400 (EDT)
- References: <f86qdq$o7p$1@smc.vnet.net>
Nasser Abbasi schrieb:
> hi, I am using version 6
>
> what is the trick to make Sum[] just print the terms first, before
> adding them? Say I want to do
>
> r= Sum[n,{n,1,5}]
>
> But I want to see 1+2+3+4+5, i.e. the terms printed out before they
> are actually added.
>
> then later I can do Evaluate[r] or N[r] something like this to get it
> to actually do the sum.
>
Try:
Sum[HoldForm[#]&[n],{n,1,5}]
Gruss Peter
--
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Peter Breitfeld, Bad Saulgau, Germany -- http://www.pBreitfeld.de