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"}

}

}

R does not give me an error message, but it is also not doing anything...
can somebody be of help?
Thanks
Katrin

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