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How to get values from dataframe's column conditional on other column

Rob Steele 
There's more than one way to do it.  My favorite:

df <- data.frame(X = c(0.12, -0.24, 0.34),
                  Y = c(TRUE, TRUE, FALSE))

subset(df, Y, X)

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Yuri Volchik How to get values from dataframe's column conditional on other column Jun 13 Dirk Eddelbuettel How to get values from dataframe's column conditional on other column Jun 13 Gabor Grothendieck How to get values from dataframe's column conditional on other column Jun 13 Gabor Grothendieck How to get values from dataframe's column conditional on other column Jun 13 Gabor Grothendieck How to get values from dataframe's column conditional on other column Jun 13 Rob Steele How to get values from dataframe's column conditional on other column Jun 13