CODEWITHSUNDEEP
r
Vedda
Vedda

Reputation: 7435

Select files in a directory from vector

How would I use list.files() to select only those files that are selected in a vector files? The files in the directory are .rds files.

files <- c(20388, 20389, 20390)

I've tried this, but not returning anything.

list.files("Data/", pattern = paste0(files, ".rds"), full.names = TRUE)

Upvotes: 0

Views: 1172

Answers (1)

mtoto
mtoto

Reputation: 24188

The argument you're passing to pattern = is where things are going wrong I believe. This three-step approach might get you the desired result:

# Extract all .rds files
list <- list.files("Data/", pattern =".rds", full.names = TRUE)

# Define pattern for grepl
files <- c(20388, 20389, 20390)
pattern <- paste(files, sep="", collapse="|")

# Results in
pattern
[1] "20388|20389|20390" # grepl will interpret "|" as "or"

# Now we can subset list with the following
list[grepl(pattern,list)]

Upvotes: 3

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