r - Selecting columns from data.table -

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• extract column data.table vector, position 1 answer

i trying select single column datatable. need array of values, , not data table single column.

currently casting data table dataframe, select desired column. ideas how can directly?

df = data.frame(a = 1:5, b = 6:10) class(df[,'a']) # integer - (desired format) class(df[,1]) # integer - (desired format)  dt = data.table(df) class(dt[,'a', = f]) # "data.table" "data.frame" class(dt[,1, = f])  # "data.table" "data.frame"  # cast dataframe , select class(as.data.frame(dt)[,'a']) # integer - (desired format) 

you can try :

class(dt[,a]) # integer