R reference filtering column by variable name

Question

Is there a way to get a filtered data frame, like this:

data[data$Measure=="Baseline",]

using a variable Name for Measure, i.e. measVarName == "Measure"?

Thanks.

Yeah, you can't use variables with `$` but you can with `[` and `[[`. So `data[data[[measVarName]] == "Baseline", ]` — Gregor Thomas, Apr 24 '18 at 14:33
Look at this example: `measVarName <- "mpg"; mtcars[mtcars[measVarName]==19.2,]` — CPak, Apr 24 '18 at 14:35

score 3 · Answer 1 · answered Apr 24 '18 at 14:33

3

Double bracket notation lets you select variables using a character string stored in a variable:

measVarName <- 'Measure'
data[data[[measVarName]] == 'Baseline',]

answered Apr 24 '18 at 14:33

divibisan

1 Answers1