if else elseif for data frames

The thing is I have about 10 cases. I saw the ifelse statement but was
wondering if there was a cleaner method of doing it. The coding will get
really messy when I write all 10 cases.

Cheers,
Sachin

On Mon, Aug 13, 2012 at 11:04 AM, arun <smartpink111 at yahoo.com> wrote:

Hi,
Try this:
dat1<-data.frame(col1=c(rep("high",3),rep("Neutral",3),rep("low",4)))

 dat1$col2<-ifelse(dat1$col1=="high",dat1$col2<-"H",ifelse(dat1$col1=="Neutral",dat1$col2<-"N","L"))
dat1
      col1 col2
1     high    H
2     high    H
3     high    H
4  Neutral    N
5  Neutral    N
6  Neutral    N
7      low    L
8      low    L
9      low    L
10     low    L

A.K.




----- Original Message -----
From: Sachinthaka Abeywardana <sachin.abeywardana at gmail.com>
To: r-help at r-project.org
Cc:
Sent: Sunday, August 12, 2012 8:43 PM
Subject: [R] if else elseif for data frames

Hi all,

It seems like I cannot use normal 'if' for data frames. What would be the
best way to do the following.

if data$col1='high'
    data$col2='H'
else if data$col1='Neutral'
    data$col2='N'
else if data$col='low'
   data$col2='L'
else
   #chuch a warning?


Note that col2 was not an existing column and was newly assigned for this
task.

Thanks,
Sachin

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