Re: Sum of list elements
- To: mathgroup at smc.vnet.net
- Subject: [mg49331] Re: Sum of list elements
- From: Bill Rowe <readnewsciv at earthlink.net>
- Date: Wed, 14 Jul 2004 07:29:39 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
On 7/13/04 at 4:32 AM, spam at husumtoften.invalid (Per R¯nne) wrote:
>I'm trying to find a function [possibly a way to make a function]
>which calculate the sum of the elements of a list.
>Right now, the purpose is to find the relative distribution of the
>elements of a list. That is, I need a way to get out that the
>distribution of:
>{2, 2, 1}
>is
>{2/5, 2/5, 1/5}.
Probably the most direct way of obtaining the sum of a list of elements would be to Apply Plus to the list, i.e.,
Plus@@list
For lists that are vectors
Tr[list]
will work as well and executes faster
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