R reference filtering column by variable name [duplicate]

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
– Gregor Thomas, Commented Apr 24, 2018 at 14:33
Look at this example: measVarName <- "mpg"; mtcars[mtcars[measVarName]==19.2,] — CPak
– CPak, Commented Apr 24, 2018 at 14:35

divibisan · Accepted Answer · 2018-04-24 14:33:34Z

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, 2018 at 14:33

divibisan

12.2k11 gold badges44 silver badges63 bronze badges

Sign up to request clarification or add additional context in comments.

1 Answer 1