CODEWITHSUNDEEP
r
zjffdu
zjffdu

Reputation: 28754

How to do map function on vector in R?

I have a vector like (1,100,2,30,20,...)

And what I'd like to do is mapping these value to another value. Actually I can do a loop on these values, but I wonder whether I can make the map function vectorized. For example, I'd like to map the value to its bucket such as following

1 ->  "< 10",
20 -> "10 to 50", 
60 -> "50 to 100",

Thanks

Upvotes: 4

Views: 9896

Answers (2)

algotrific
algotrific

Reputation: 323

Use Purrr's map (https://www.rdocumentation.org/packages/purrr/versions/0.1.0/topics/map )

e.g. 

xx=c(1,4,0,3,1)

f = function(s) return(c((10*s):(10*s+9)))
xx %>% map(f)

Upvotes: 2

thelatemail
thelatemail

Reputation: 93813

What about something like this?

test <- c(1,24,2,30,20)

sapply(
    # bin the data up
    findInterval(test,seq(0,30,10)),
    # apply a particular function to the data element
    # dependent on which bin it was put into
    function(x) switch(x,sqrt(x),sin(x),cos(x),tan(x))
    )

[1]  1.0000000 -0.9899925  1.0000000  1.1578213 -0.9899925

Upvotes: 4

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