On 10-05-2013, at 10:59, KatrinH Heimann <katrinheim...@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
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