[R] Difference in 'read.table' between R.1.4.1 and R1.5.0

[james.holtman@convergys.com]

This sequence of commands worked fine in R.1.4.1.  The data file was the
same in both instances:

>    acct.log <- read.table(file, col.names=c('cmd', 'user', 'start',
'end',
+         'elapsed', 'sys', 'usr', 'cpu', 'char', 'blocks'),
+         colClasses=c('NA', 'NA', rep('numeric', 7),'integer'),
+         comment.char='')
> version
         _
platform i386-pc-mingw32
arch     x86
os       Win32
system   x86, Win32
status
major    1
minor    4.1
year     2002
month    01
day      30
language R
>


When run under R.1.5.0, I got the following error:

> acct.log <- read.table(file, col.names=c('cmd', 'user', 'start', 'end',
+      'elapsed', 'sys', 'usr', 'cpu', 'char', 'blocks'),
+      colClasses=c('NA', 'NA', rep('numeric', 7),'integer'),
+      comment.char='')
Error: couldn't find function "as"
> version
         _
platform i386-pc-mingw32
arch     i386
os       mingw32
system   i386, mingw32
status
major    1
minor    5.0
year     2002
month    04
day      29
language R
>


There appears to be a call to "as" in read.table, but this object if not
defined:

 for (i in 1:cols) {
        if (known[i])
            next
        data[[i]] <- if (!is.na(colClasses[i]))
            as(data[[i]], colClasses[i])
        else type.convert(data[[i]], as.is = as.is[i], dec = dec)
    }




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