[R] Help with character columns in a table

[Rory Campbell-Lange]

I have done a read.table on a data file with the aim of extracting
subsets of the data eg

    table[table$desc = 'result1',]

How can I convert $desc to a character type? At present it is seen by
typeof() as an integer.

How can I do the equivalent of 

    table[table$desc = 'result1' && table$amt > 20, ]

Thanks,
Rory

-- 
Rory Campbell-Lange 
<rory at campbell-lange.net>
<www.campbell-lange.net>