scan empty strings or data without NAs??

I just discovered that it is not possible to read in data with scan() and to
have no na.strings at all

  scan(na.strings=NULL)

gives an error message "invalid na.strings value".

Furthermore it is not possible to read in empty strings, without automatic
conversion to 'NA', because of

    if (!missing(sep))
        na.strings <- c(na.strings, "")

within scan()

As scan() is a very basic function in R, I wish it would allow specifying
na.strings=NULL and importing empty strings. Is there any specific reason
not to allow this ?

Regards



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Dr. Jens Oehlschl?gel-Akiyoshi
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