Fill a dataframe in a for-loop in R

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I'm a total newbie at R, and probably am making a silly mistake, but I've been stuck on this for hours now. I have a dataframe (countries.averages) with row/column titles and the correct size filled with NA's that I am trying to fill using a for loop. Country.names is a large dataset that looks something like this.

   A   B   C   D 
A  1   3   3   4
B  2   1   3   4
A  4   2   1   3
C  3   2   2   1

Here's the code:

num.countries<-4
for (i in num.countries){
  for (j in num.countries){
    x<-paste0(country.names[i])
    y<-paste0(country.names[j])
    z<-subset(Voting.50.50,Country==x)
    country.average[i,j]<-mean(z[,j],na.rm=TRUE)
  }
}

The problem is with writing the dataframe, country.averages[i,j]. I know this is probably not correct, but I have no idea why, or what else to do. I'm not sure of the correct terminology (sorry!), but is there some other way to write a value to a specific cell in a dataframe?

asked 44 secs ago

Emily Carter

1

Fill a dataframe in a for-loop in R