r - Replacing rank value for each string in a character vector -

i have character vector in r, , want assign specific rank each vector element , use rank in computations, how can this?

for example, degree vector defined follows:

degree = c("low","med","high")

and want assign rank 1 3 each degree , replacing degrees of defined vector ranks:

blood_pressure = c("low","low","high","med","high") blood_pressure = c(1,1,3,2,3)

simply use as.numeric , factor, this:

degree = c("low","med","high") blood_pressure = c("low","low","high","med","high") as.numeric(factor(blood_pressure, degree)) # [1] 1 1 3 2 3

another option, results in named vector, create named version of "degree" , basic matching. example:

setnames(seq_along(degree), degree)[blood_pressure] #  low  low high  med high  #    1    1    3    2    3

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