Message-ID: <49902CF4.9090409@idi.ntnu.no>
Date: 2009-02-09T13:17:40Z
From: Wacek Kusnierczyk
Subject: question about mean
In-Reply-To: <37B6CE29-451F-4319-9C7F-450190154920@auckland.ac.nz>
Rolf Turner wrote:
>
> On 9/02/2009, at 4:40 PM, Bill.Venables at csiro.au wrote:
>
>> Store your 'matrix' as a data frame.
>
> Surely it's a data frame already, since ``school'' is character or
> factor,
> and ``value'' is (must be?) numeric.
>
> People have this unfortunate predilection to refer to data frames as
> matrices, and this messes them, and everybody else, up.
still, a naive user's messing up data frames with matrices seems no
worse than an experrienced (?) r programmer's messing up lists with vectors.
vQ