[R] How to add a variable to a dataframe whose values are conditional upon the values of an existing variable

[David Freedman]

there's a recode function in the Hmisc package, but it's difficult (at least
for me) to find documentation for it

library(Hmisc)
week <- c('SAT', 'SUN', 'MON', 'FRI');
recode(week,c('SAT', 'SUN', 'MON', 'FRI'),1:4)

HTH
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