[R] Prevent read.table from converting "+" and "-" to 0

[Duncan Murdoch]

On 11/4/2008 9:08 AM, Daren Tan wrote:
> I am using read.table("data.txt", sep="\t") to read in a tab-limited text file. However, two columns of data were read wrongly. read.table converts "+" and "-" in the two columns to 0. I have tried setting other parameters but to no avail. 

Set the column classes (using the colClasses argument).  It is guessing 
numeric, but clearly that's not true.

Duncan Murdoch