Hi, R listers,
I��m trying to compare a value of a row in a column to values of previous rows
in another column in a loop. ��i�� is just from first row to the last row. j is
an another looping controller indicating the rows that row[i] will be compared
to and j will be rows before row[i]. I want to compare phone_1[i] with
phone_2[j] and vise versa.
for (i in 1: nrow(df)) {
if (df$Incremental[i] == 1) {mark[i] <- 1}
else {for (j in (i �C df$Incremental[i] + 1) : (i - 1)) {
if ((df$Phone_1[i] != "" & df$Phone_1[i] == df$Phone_2[j]) |
(df$Phone_2[i] != "" & df$Phone_2[i] == df$Phone_1[j])) {
mark[i] <- mark[j]}
else {mark[i] <- mark[i-1] + 1}
}
}
However I��m getting an error with phone_1[i] and phone_2[j], indicating that
��level sets of factors are different��. I��m not sure what I need to do to fix
it.
Thanks!
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