I have a data frame (a csv file) with dimensions 100x6 and I need only the columns c(X1, X2, X4) and the rows in which the value of X1 is greater than 30. So I did:  data_frame <- read.csv (data_frame)  data_frame [c(X1, X2, X4)]The column subset problem is solved but now I need to subset rows from data_frame [c(X1, X2, X4)] where the values of X1 is greater than 30. I tried:  data_frame [c(X1 > 30), c(X1, X2, X4)] But it returned the same data frame as data_frame [c(X1, X2, X4)].Also tried using the function subset() with the same approach but got the same results.
How to subset rows from a data frame with comparison operators in R
r
You wantdata_frame[data_frame$X1 > 30, c(X1,X2,X4)]that will just print it, you probably want to update data_frame or store it in something else:data_frame = data_frame[data_frame$X1 > 30, c(X1,X2,X4)]also you probably want to try asking this on StackOverflow, or reading a bit more basic R documentation because it should be well covered. Its a bit simple to be data science.