Hi, The read.csv.ffdf function in package ff will create the ff object physical file in the default directories, I am trying to let the files created in the paths users specify, I think the point is to make use of the asffdf_args parameter, I have a test CSV file named D:\rtemp\fftest.csv, the content of the file is as following:
col1,col2,col3 1,"amber",2.4 2,"linda",4.5 I tried the following code, hoping ff will create the physical files for col1,col2 and col3 to D:/a.f,D:/b.f,D:/c.f respectively fdf <- read.csv.ffdf(file="D:/rtemp/fftest.csv",asffdf_args = list( col_args = c(list(filename="D:/a.f"), list(filename="D:/b.f"), list(filename="D:/c.f")))) and the error message is : Error in as.ff.default(1:2, vmode = NULL, filename = "D:/a.f", filename = "D:/b.f", : formal argument "filename" matched by multiple actual arguments I also tried the following: > fdf <- read.csv.ffdf(file="D:/rtemp/fftest.csv",asffdf_args = list( col_args > = list(filename=c("D:/a.f","D:/b.f","D:/c.f")))) Error in ff(initdata = initdata, length = length, levels = levels, ordered = ordered, : bad argument initdata for existing file; initializing existing file is invalid In addition: Warning messages: 1: In if (file.exists(filename)) { : the condition has length > 1 and only the first element will be used 2: In if (file.exists(filename)) { : the condition has length > 1 and only the first element will be used 3: In if (file.access(filename, 4) == -1) { : the condition has length > 1 and only the first element will be used 4: In if (file.access(filename, 2) == -1) { : the condition has length > 1 and only the first element will be used 5: In if (is.na(filesize)) stop("unable to open file") : the condition has length > 1 and only the first element will be used My questions are: 1. What's the datatype of the col_args parameter of the as.ffdf function 2. If I can make layout of the asffdf_args parameter correct, how can I set the exact filenames for each column of the ff data frame. Regards, Xiaobo Gu ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.