#I have a dataframe called "tests" that contain "character expressions". These
characters are rules that use data from within another dataframe. Is there
any way within R I can access the rules in the dataframe called tests, and
then "evaluate" these "rules"?
#An example may better explain what I am trying to accomplish:
tests <- data.frame(matrix(data=c("info$country == 'Greenland'", "info$age
> 50"), nrow=2, ncol=1))
names(tests) <- "rule"
info <- data.frame(matrix(data=NA, nrow=5, ncol=3))
names(info) <- c("first", "country", "age")
info$name <- c("Mary", "Paul", "Robert", "John", "Ivan")
info$country <- c("GReenland", "Iceland", "Ireland", "Greenland",
"Greenland")
info$age <- c(30, 55, 66, 79, 80)
#e.g. for
"info$country == 'Greenland'"
#I want:
info$country == 'Greenland'
[1] FALSE FALSE FALSE TRUE TRUE
#e.g.
info$country == 'Greenland'
info$age > 50
#I tried this, but it does not "work":
eval(tests$rule[1])
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