Somewhere in between the R-Versions 2.6 and 2.7 the behaviour of the
function type.convert and therefore also read.table, read.csv, etc.
has changed (see below):
In 2.6 and before:
> type.convert(c("+", "-", "+"))
[1] + - +
Levels: + -
In 2.7 and later:
> type.convert(c("+", "-", "+"))
[1] 0 0 0
Apparently, the character strings "+" and "-" are now interpreted as
numeric and not any more as factors or character strings.
I have quite a number of files with columns that contain "+" or "-"
and would like to convert these to characters or factors, without
having to specify the individual column types manually.
Is there any way to still do so in a new version of R?
Many thanks and best wishes,
Tim
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