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mhkeller/Turn a multi-valued variable into a binary variable

Created May 4, 2012 01:57
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Nice for grouping and summing in R
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Turn a multi-valued variable into a binary variable
df <- read.csv("data.csv")
df$new_column1<- ifelse(df$c3 == "A",1,0)
df$new_column2<- ifelse(df$c4 == "B",1,0)
df$new_column3 <-ifelse(df$c5 == "C" & df$c6 = D, 1, 0)
via @BrianAbelson
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