faster way to use filter this
You neglected the commas in your index expression! See ?match as in:
out <- cost[match(data,index)] out
[1] 50 100 NA (and "data" is a bad name to use as there is already a data() function in R). Please DO go through an R tutorial or two to learn about some of these basic, useful R capabilities. There are many good ones on the Web. Cheers, Bert Bert Gunter "The trouble with having an open mind is that people keep coming along and sticking things into it." -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
On Fri, Apr 15, 2016 at 5:58 PM, Paul Tremblay <paulhtremblay at gmail.com> wrote:
I have the following (simplified) vectors:
index <- c("shoe" "shirt" "fruit")
cost <- c(100, 50, 2)
data <- c("shirt", "shoe", "vegetable")
I want my outcome to be:
(50, 100, 0)
(shirt => 50, shoe => 100, vegetable => not found, so 0)
I have written the following function:
for (i in custom_list) {
+ this_cost <- cost[index == i]
+ message(this_cost)
+ }
This gives me (50, 100)
I haven't figured out how to use the ifelse. But more importantly, I think
there should be an easier, and faster way to do this with vectors?
Thanks!
Paul
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