CODEWITHSUNDEEP
rdirectory
Sander Van der Zeeuw
Sander Van der Zeeuw

Reputation: 1092

Match a pattern to select files out of a directory

lets say i run the function list.files()

I will get a character vector looking like this:

 tst<-c("Test.Uncx4.1_2281.2_deBruijn.txt", "Test.Vax1_3499.1_deBruijn.txt", 
"Test.Vax2_3500.1_deBruijn.txt", "Test.Vsx1_1728.1_deBruijn.txt", 
"Train.Alx3_3418.2_deBruijn.txt", "Train.Alx4_1744.1_deBruijn.txt", 
"Train.Arx_1738.2_deBruijn.txt", "Train.Bapx1_2343.1_deBruijn.txt", 
"Train.Barhl1_2590.2_deBruijn.txt", "Train.Barhl2_3868.1_deBruijn.txt"
)

The problem I’m experiencing is when using the parameter pattern from list.files() Like this: list.files(dirs[1], pattern = "^[Train]",ignore.case=F)

I still get all the files back while i`m expecting to get only the Train files. like this:

c("Train.Alx3_3418.2_deBruijn.txt", "Train.Alx4_1744.1_deBruijn.txt", 
"Train.Arx_1738.2_deBruijn.txt", "Train.Bapx1_2343.1_deBruijn.txt", 
"Train.Barhl1_2590.2_deBruijn.txt", "Train.Barhl2_3868.1_deBruijn.txt")

How is this possible or what did i do wrong?

Upvotes: 0

Views: 1988

Answers (1)

juba
juba

Reputation: 49033

What you want is :

list.files(dirs[1], pattern = "^Train",ignore.case=F)

With the pattern you provided, with the brackets, you were filtering for files whose names begin with T, r, a, i or n.

Upvotes: 3

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