Message-ID: <82FF6F70-3E6A-4EA9-9652-62239497CE17@comcast.net>
Date: 2009-11-29T05:00:58Z
From: David Winsemius
Subject: What is the equivalent of column.prods() from S in R?
In-Reply-To: <366c6f340911282028q6c4cde26he3e23caa671364a7@mail.gmail.com>
On Nov 28, 2009, at 11:28 PM, Peng Yu wrote:
> On Mon, Nov 9, 2009 at 8:35 PM, David Winsemius <dwinsemius at comcast.net
> > wrote:
>>
>> On Nov 9, 2009, at 8:43 PM, Peng Yu wrote:
>>
>>> Chambers' book Statistical Models in S mentioned 'column.prods()'.
>>> But
>>> I don't find it in R. I'm wondering if there is an equivalent in R?
>>
>> ??rowProds
>> ??colProds
>>
>> (They are in both fUtilities and timeSeries.)
>
> Are you sure that colProds() is equivalent to column.prods()? It seems
> that column.prods() should be a very basic function in S, but I have
> to load a package in order to call colProds().
>
> I don't see how to construct a matrix give terms as mentioned in the
> book. Would you please give me some examples?
Page numbers? Specifics? ....something to go on?
>
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David Winsemius, MD
Heritage Laboratories
West Hartford, CT