Does anybody understand what's going on here:
I have the following ascii file called "y.txt"
"USD-DEM" "USD-JPY" "DEM-JPY"
0.344901 4.78712 4.442
0.345715 4.7882 4.44189
0.350657 4.79065 4.44177
0.35347 4.79065 4.43616
0.35368 4.78957 4.43622
0.35361 4.78982 4.43669
0.353821 4.79036 4.43622
0.352767 4.78899 4.43634
0.353119 4.78916 4.43545
In R I do the following:
wu161215{adrian}28: R
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Version 0.64.2 (July 3, 1999)
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> x<-scan("y.txt")
Error: "scan" expected a real got
""USD-DEM""> row.lens <- count.fields("y.txt")
> any(row.lens != row.lens[1])
[1] TRUE>
> x<-scan("y.txt", skip=1)
Read 27 items> row.lens <- count.fields("y.txt")
> any(row.lens != row.lens[1])
[1] FALSE>
scan seems to produce some side-effect (not properly close the file?)
I am using Redhat 5.2 and in general R seems to be rather stable...
Thanks
Adrian
--
Adrian Trapletti, Vienna University of Economics and Business
Administration, Augasse 2-6, A-1090 Vienna, Austria
Phone: ++43 1 31336 4561, Fax: ++43 1 31336 708,
Email: adrian.trapletti@wu-wien.ac.at
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Adrian, you seem to report several things at once,... I think, first you really don't want scan but rather read.table with your file>> I have the following ascii file called "y.txt" >> >> "USD-DEM" "USD-JPY" "DEM-JPY" >> 0.344901 4.78712 4.442 >> 0.345715 4.7882 4.44189 >> 0.350657 4.79065 4.44177 >> 0.35347 4.79065 4.43616 >> 0.35368 4.78957 4.43622 >> 0.35361 4.78982 4.43669 >> 0.353821 4.79036 4.43622 >> 0.352767 4.78899 4.43634 >> 0.353119 4.78916 4.43545which gives R> str(read.table("y.txt",head=T)) `data.frame': 9 obs. of 3 variables: $ USD-DEM: num 0.345 0.346 0.351 0.353 0.354 ... $ USD-JPY: num 4.79 4.79 4.79 4.79 4.79 ... $ DEM-JPY: num 4.44 4.44 4.44 4.44 4.44 ... --------- Then you report that scan() leaves something ``behind'' {open file, ??} after stopping with an error. This is clearly a bug and is still present in the current 0.65 snapshot. After a few tests, I see that the problem seems to happen only (sometimes) when the text leading to the error contains a ` " ' . The following is even simpler : write(c(paste("\"", LETTERS[1:3],"\"", sep=""),1:3), nc=3) scan("data") # gives error as it should count.fields("data") # will be wrong count.fields("data") # is now ok : 3 3 Gives (in 0.65 snapshot) > write(c(paste("\"", LETTERS[1:3],"\"", sep=""),1:3), nc=3) > scan("data") # gives error as it should Error: "scan" expected a real got ""A"" > count.fields("data") # will be wrong [1] 4 3 > count.fields("data") # is now ok : 3 3 [1] 3 3 --> I'll report to R-bugs -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-devel mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-devel-request@stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._