Le 10/11/2014 22:15, John McKown a écrit :
On Mon, Nov 10, 2014 at 7:12 AM, Aditya Singh <aps...@yahoo.com> wrote:
Hi,
I have 2 queries:
1. What function to use to read all the files in a directory to a vector
in R code?
In the package phenology, a function read_folder can be used to read all
the files at one time into a list. After you can use unlist():
Description
To create a list, the syntax is
datalist<-read_folder(folder=".", read=read.delim, header=FALSE)
Return NULL with a warning if the folder does not exist or is empty. The
names of the elements of the list are the filenames.
Usage
read_folder(folder = try(file.choose(), silent = TRUE), wildcard =
"*.*", read = read.delim, ...)
Arguments
folder Where to search for files; can be or a file path or a folder path
wildcard Define which files are to be read (examples: "*.*", "*.xls",
"essai*.txt")
read Function used to read file. Ex: read.delim or read.xls from gdata
package
... Parameters send to the read function
Sincerely,
Marc Girondot
2. What function to use to coerce character string into numeric?
As a help to others, I figured out to use setwd("C:/....") to set working
directory!
Aditya
First, please don't post in HTML. It is contrary to forum policy. Thanks.
Answer 1: you can get a list of the names of all the files using the
list.files() function. Do a ?list.files for more information.
Answer 2: If I understand your question correctly, then I'd use
as.numeric() .
Suggestion 1: Get & read a good book on R programming. These were very
basic questions. I'd strongly suggest "Advanced R" by Hadley Wickham. You
can order if Amazon.com, or read it (for free!) here:
http://adv-r.had.co.nz/
Another good one is "The Art of R Programming" by Norman Matloff. This
later one is what I used, but that's mainly because Hadley's book hadn't
been written (or maybe published) when I was first learning R.
Suggestion 2: If you haven't already, I would strongly recommend getting &
installing RStudio. It is free (as in beer, which is a curious phrase
because beer isn't usually free). http://www.rstudio.com
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