Re: strange scan, count.fields --> BUG

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Subject: Re: strange scan, count.fields --> BUG
From: Martin Maechler (maechler@stat.math.ethz.ch)
Date: Sat 14 Aug 1999 - 01:02:33 EST


Message-Id: <199908131502.RAA12663@sophie.ethz.ch>

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 4.43545

which 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
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