From murdoch@stats.uwo.ca  Fri Jan  5 16:45:31 2001
From: murdoch@stats.uwo.ca (Duncan Murdoch)
Date: Fri, 05 Jan 2001 11:45:31 -0500
Subject: [Rd] crash with scan(..., what=list(,,)) (PR#802)
In-Reply-To: <200101051611.RAA27177@pubhealth.ku.dk>
References: <200101051611.RAA27177@pubhealth.ku.dk>
Message-ID: <3a58f95a.70953969@fisher.stats.uwo.ca>

On Fri, 5 Jan 2001 17:11:13 +0100 (MET), you wrote in message
<200101051611.RAA27177@pubhealth.ku.dk>:

>When reading a file with scan(), the following crashes R under Solaris and
>WinNT 4.0 (versions below):
>
>> ads <- scan("Bltiadu.dat", what=list(,,))

I crash Win98 with the same sort of line; it's because list(,,) is the
same as list(), and scan isn't checking for this boundary case, I
guess...

>
>Would an error message be more logical? Note that the followings work (the
>data file has 201 lines and 3 columns):
>
>> ads <- scan("Bltiadu.dat", what=list(0,,))
>Read 603 lines

While fixing this, wouldn't it be better to change this message to 

"Read 603 cases"

since in fact, only 201 lines were read, 3 cases per line?

Duncan Murdoch
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[Rd] crash with scan(..., what=list(,,)) (PR#802)
Duncan Murdoch