mode(x) <- "double"

Hi,
I need your help!! 
I imported a big coloumn vector from a txt file but it results as mode
:"list" I want to change it in numeric otherwise I can't do my analysis.
This is what i get:

mode (data) <- "double"
Error in eval(expr, envir, enclos) : 
 (list) object cannot be coerced to type 'double'

Thanks a lot!!!

Alessandra

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