[R] Replacing values in a dataframe depending on several conditions

[Berend Hasselman]

On 10-05-2013, at 10:59, KatrinH Heimann <katrinheimann at gmail.com> wrote:

> Dear all,
> 
> I would like to replace some values in a dataframe (including the columns
> Action, Interval and Artificiality) depending on a combination of different
> conditions
> 
> the command I tried is
> 
> for (j in 1:nrow(data))
> 
> {
> 
> if ((data[j,data$Action]=="s") & (data[j,data$Interval]=="l") & (data[j,data
> $Artificiality]!="a")) {data[j,data$Artificiality]<-"na"}
> 
> else {
> 
> if ((data[j,data$Action]=="l") & (data[j,data$Interval]=="s") & (data[j,data
> $Artificiality]!="a")) {data[j,data$Artificiality]<-"na"}
> 
> }
> 
> }

Addendum:

You can also use

data$Action[j]

etc.

Berend