Dear useRs, I have a number of text file located at a certain location with the following names. s1.txt,s2.txt,s3.txt,s4.txt,s5.txt...............s120.txt when i read them, before opening them, by using filelist = list.files(pattern = ".s*.txt") The are opened in the following order [1] "s1.txt" "s10.txt" "s100.txt" "s101.txt" "s102.txt" "s103.txt" "s104.txt" "s105.txt" "s106.txt" "s107.txt" "s108.txt" "s109.txt" "s11.txt" "s110.txt" [15] "s111.txt" "s112.txt" "s113.txt" "s114.txt" "s115.txt" "s116.txt" "s117.txt" "s118.txt" "s119.txt" "s12.txt" "s120.txt" "s13.txt" "s14.txt" "s15.txt" [29] "s16.txt" "s17.txt" "s18.txt" "s19.txt" "s2.txt" "s20.txt" "s21.txt" "s22.txt" "s23.txt" "s24.txt" "s25.txt" "s26.txt" "s27.txt" "s28.txt" [43] "s29.txt" "s3.txt" "s30.txt" "s31.txt" "s32.txt" "s33.txt" "s34.txt" "s35.txt" "s36.txt" "s37.txt" "s38.txt" "s39.txt" "s4.txt" "s40.txt" [57] "s41.txt" "s42.txt" "s43.txt" "s44.txt" "s45.txt" "s46.txt" "s47.txt" "s48.txt" "s49.txt" "s5.txt" "s50.txt" "s51.txt" "s52.txt" "s53.txt" [71] "s54.txt" "s55.txt" "s56.txt" "s57.txt" "s58.txt" "s59.txt" "s6.txt" "s60.txt" "s61.txt" "s62.txt" "s63.txt" "s64.txt" "s65.txt" "s66.txt" [85] "s67.txt" "s68.txt" "s69.txt" "s7.txt" "s70.txt" "s71.txt" "s72.txt" "s73.txt" "s74.txt" "s75.txt" "s76.txt" "s77.txt" "s78.txt" "s79.txt" [99] "s8.txt" "s80.txt" "s81.txt" "s82.txt" "s83.txt" "s84.txt" "s85.txt" "s86.txt" "s87.txt" "s88.txt" "s89.txt" "s9.txt" "s90.txt" "s91.txt" [113] "s92.txt" "s93.txt" "s94.txt" "s95.txt" "s96.txt" "s97.txt" "s98.txt" "s99.txt" How can I open them systematically starting from s1,s2,s3 and all the way upto s120? Thankyou very much indeed in advance. Eliza [[alternative HTML version deleted]]