Unimplemented type list when trying to write.table

Question

I have the following data.table (data.frame) called output:

> head(output)
        Id                                           Title IsProhibited
1 10000         


        

Answer 1

Those are all elegant solutions.

For the curious reader who would prefer some R-code to ready made packages , here's an R-function that returns a non-list dataframe that can be exported and saved as .csv.

output is the "troublesome" data frame in question.

df_unlist<-function(df){

df<-as.data.frame(df)

nr<-nrow(df)

c.names<-colnames(df)

lscols<-as.vector(which(apply(df,2,is.list)==TRUE))

if(length(lscols)!=0){

for(i in lscols){

temp<-as.vector(unlist(df[,i]))

if(length(temp)!=nr){

adj<-nr-length(temp)

temp<-c(rep(0,adj),temp)

}

df[,i]<-temp

} #end for

df<-as.data.frame(df)

colnames(df)<-c.names
}
return(df)
}

Apply the function on dataframe "output" :

newDF<-df_unlist(output)

You can next confirm that the new (newDF) data frame is not 'listed' via apply(). This should successfully return FALSE.

apply(newDF,2,is.list)         #2 for column-wise step.

Proceed to save the new dataframe, newDF as a .csv file to a path of your choice.

write.csv(newDF,"E:/Data/newDF.csv")