import - R - Reading unknown number of files -


this question has answer here:

i'm new r. try process experimental data , i'm stuck bug when reading files. want read data files in folder don't know how many there. know files named "subject1manualx.log", x being 1 or higher. since didn't find possibility count how many files in folder, try open files in while loop until exception raised (i.e. try open "subject1manual1.log", "subject1manual2.log" etc).

here code (prints debug):

# script work on et data temp <- 0  while (temp == 0){   trycatch({     subjectdata <- read.delim("d:/doctorat/xps/xp1-2_lipsmwa/smarteye/subject1/subject1manual3.log")    }, warning = function(w){     print(paste("warning", i))     temp <- 1    }, error = function(e){     print(paste("error", i))     temp <- 1    }, = {     print("finished")   }) }

unfortunately doesn't work (that's why i'm here...). know have warnings , errors. if handle warnings, r crashes because errors aren't handled ("all connection in use" crash). if handle errors, doesn't go through , while loop continues @ each iteration.

any idea on matter highly appreciated (including better ways read unknown number of files). thank time!

pyxel

edit: ok nice persons answered how import multiple data files, curiosity know how deal try catch within while loop. idea?

# here read path '*.log' files in folder path_to_files = dir("d:/doctorat/xps/xp1-2_lipsmwa/smarteye/subject1/",                      full.names = true,                      recursive = true,                      pattern = "\\.log$")  # further read files list files = lapply(path_to_files, read.delim)  # , finaly combine files single data.frame # headers of files should identical res = do.call(rbind, files)

update code trycatch , while. not safe , grows data.frame in loop - bad practice. 

subjectdata = true = 1 res = null while (!is.null(subjectdata)){     subjectdata <-  trycatch({         read.delim(sprintf("d:/doctorat/xps/xp1-2_lipsmwa/smarteye/subject1/subject1manual%s.log", i))      }, warning = function(w){         print(paste("warning", i))         null      }, error = function(e){         print(paste("error", i))         null      })     if(is.null(res)){         res = subjectdata     } else {         res = rbind(res, subjectdata)     }     = + 1 }

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