On Sun, 29 Jan 2006, Marc Schwartz wrote:
I would argue against this.
If this were the default, that is requiring user interaction, it would
break a fair amount of code that I (and I am sure a lot of others have)
where automation is critical.
I don't see how. The current default is
read.table()
Error in read.table() : argument "file" is missing, with no default
so the only change is that the default might do something useful.
Nor do I see the change would help, as the same people would still use a
character string for 'file' and not omit the argument. (It seems very
unlikely that they would read any documentation that suggested things had
changed.)
The same issue could be made over scan(), where the current default is
useful.
A lot of the issues seem to be user errors, file permission errors,
hidden extensions as is pointed out below and related issues. If there
is a legitimate bug in R resulting in these issues, then let's patch
that. However, I don't think that I can recall reproducible situations
where a bug in R is the root cause of these problems.
Nor I.
Note that file.choose does not protect you against file permission issues
(actually, on a command-line Unix-alike it does nothing much useful at
all):
readLines(file.choose())
Enter file name: errs.txt
Error in file(con, "r") : unable to open connection
In addition: Warning message:
cannot open file 'errs.txt', reason 'Permission denied'
but
file.show(file.choose())
says
NO FILE errs.txt
which is not a good idea (and I will improve).
So this would really only have any effect on GUI platforms, for people who
read the documentation.
Best regards,
Marc Schwartz
On Sun, 2006-01-29 at 12:18 -0500, Duncan Murdoch wrote:
(Moved from R-help).
This comes up often enough that I'm starting to think most functions
that take filename arguments should have file.choose() as the default
value. Then one could do
read.table()
and have a dialog box pop up in Windows, or some other prompt for a
filename in other platforms. Are there any obviously bad side effects
from a change like this?
Duncan Murdoch
On 1/29/2006 11:51 AM, Peter Dalgaard wrote:
Romain Francois <[EMAIL PROTECTED]> writes:
Le 29.01.2006 16:26, oliver wee a écrit :
hello, I have just started using R for doing a project
in time series...
unfortunately, I am having trouble using the
read.table function for use in reading my data set.
This is what I'm getting:
I inputted:
data <-
read.table("D:/Oliver/Professional/Studies/Time Series
Analysis/spdc2693.data", header = TRUE)
I got:
Error in file(file, "r") : unable to open connection
In addition: Warning message:
cannot open file 'D:/Oliver/Professional/Studies/Time
Series Analysis/spdc2693.data', reason 'No such file
or directory'
as I am just a novice programmer, I really would
appreciate help from you guys. Is there a need to
setpath in R, like in java or something like that...
I am using the windows version btw.
I have also tried to put the file in the work
directory of R, so that I only typed
data <- read.table("spdc2693.data", header = TRUE)
Again, it won't work, with the same error message.
I would appreciate any help. thanks again.
Hi, try :
read.table(file.choose(), header=TRUE)
and go to your file.
Also, you can look a ?setwd, ?getwd
Right. Or just file.choose() and see what the OS thinks your file is
really called. The most common causes for symptoms like that are
(A) The file is "spcd2693.data"
(B) There's an extra extension which ever helpful Windows decided to
hide, as in "spdc2693.data.txt".
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Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
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