How can I read the files in a directory in sorted order using R?

Question

The code given below worked well and read the files in my directory and extracted the values:

X <- c(75:85) ; Y <- c(208:215) 
extract <- vector()
f         


        

Answer 1

gtools package has the function "mixedsort" that can help you.

The example myFiles was taken from Peter Verbeet answer.

myFiles <- paste("Climate_Rad_", c(1:15, 95:110), ".img", sep = "") 

install.packages ('gtools')
require ('gtools')

mixedsort (myFiles)

[1] "Climate_Rad_1.img"   "Climate_Rad_2.img"  
[3] "Climate_Rad_3.img"   "Climate_Rad_4.img"  
[5] "Climate_Rad_5.img"   "Climate_Rad_6.img"  
[7] "Climate_Rad_7.img"   "Climate_Rad_8.img"  
[9] "Climate_Rad_9.img"   "Climate_Rad_10.img" 
[11] "Climate_Rad_11.img"  "Climate_Rad_12.img" 
[13] "Climate_Rad_13.img"  "Climate_Rad_14.img" 
[15] "Climate_Rad_15.img"  "Climate_Rad_95.img" 
[17] "Climate_Rad_96.img"  "Climate_Rad_97.img" 
[19] "Climate_Rad_98.img"  "Climate_Rad_99.img" 
[21] "Climate_Rad_100.img" "Climate_Rad_101.img"
[23] "Climate_Rad_102.img" "Climate_Rad_103.img"
[25] "Climate_Rad_104.img" "Climate_Rad_105.img"
[27] "Climate_Rad_106.img" "Climate_Rad_107.img"
[29] "Climate_Rad_108.img" "Climate_Rad_109.img"
[31] "Climate_Rad_110.img"