Dear all,
I'd like to have a dataframe store information about the units of
the data it contains.
You'll find below a minimal exemple of the way I do, so far. I add a
"units" attribute to the dataframe. But I dont' like the long syntax
needed to access to the unit of a given variable (namely, something
like :
var_unit <- attr(my_frame, "units")[[match(var_name, attr(my_frame,
"names"))]]
Can anybody point me to a better solution ?
Thanks in advance,
Bruno.
# Dataframe creation
x <- c(1:10)
y <- c(11:20)
z <- c(101:110)
my_frame <- data.frame(x, y, z)
attr(my_frame, "units") <- c("x_unit", "y_unit")
#
# later on, using dataframe
for (var_name in c("x", "y")) {
idx <- match(var_name, attr(my_frame, "names"))
var_unit <- attr(my_frame, "units")[[idx]]
print (paste("max ", var_name, ": ", max(my_frame[[var_name]]), var_unit))
}
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