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I tried to select the rows based on their ID. For example, in a data frame called test, ID 201 has 6 rows of data, ID 202 has 6 rows of data too, and 203, 204….. etc.
Now I only want to extract 201 and 202 from the dataset, so it should have 12 rows altogether. However
out <- test[test$ID==c(201,202), ]
out <- subset(test, ID==c(201,202))
only returns three 201 and three 202, which are Row 1, Row 3, Row of 5 8 10 12.
Can anyone provide some suggestions that how I can do this in R?
You want
%in%, not==.