[R] Classification

[Michal Kneifl]

For all who sent help on topic Classification:

Thank you very much folks. 
I have got some inspiration how to solve this task.

Michael

----- Original Message ----- 
From: "Marc Schwartz" <marc_schwartz at comcast.net>
To: "Ing. Michal Kneifl, Ph.D." <xkneifl at mendelu.cz>
Cc: <r-help at stat.math.ethz.ch>
Sent: Wednesday, July 18, 2007 7:53 PM
Subject: Re: [R] Classification


> On Wed, 2007-07-18 at 19:36 +0200, Ing. Michal Kneifl, Ph.D. wrote:
>> Hi,
>> I am also a quite new user of R and would like to ask you for help:
>> I have a data frame where all columns are numeric variables. My aim is  
>> to convert one columnt in factors.
>> Example:
>> MD
>> 0.2
>> 0.1
>> 0.8
>> 0.3
>> 0.7
>> 0.6
>> 0.01
>> 0.2
>> 0.5
>> 1
>> 1
>> 
>> 
>> I want to make classes:
>> 0-0.2 A
>> 0.21-0.4 B
>> 0.41-0.6 C
>> ..... and so on
>> 
>> So after classification I wil get:
>> MD
>> A
>> A
>> D
>> B
>> .
>> .
>> .
>> and so on
>> 
>> Please could you give an advice to a newbie?
>> Thanks a lot in advance..
>> 
>> Michael
> 
> See ?cut
> 
> You can then do something like:
> 
>> DF
>     MD
> 1  0.20
> 2  0.10
> 3  0.80
> 4  0.30
> 5  0.70
> 6  0.60
> 7  0.01
> 8  0.20
> 9  0.50
> 10 1.00
> 11 1.00
> 
> 
>> cut(DF$MD, breaks = c(seq(0, 1, .2)), labels = LETTERS[1:5])
> [1] A A D B D C A A C E E
> Levels: A B C D E
> 
> 
> HTH,
> 
> Marc Schwartz
> 
>