R help - Oct 2006 - reading only some columns from a table

Dear R users,
  Sometimes it is needed to read only some columns from a table, in  particulare
for high frequency data. How it is possible to read just  some certain columns
using read.table ( ). The reason could be keeping  space in R and in particular
accelerating in reading data when the  number of rows are huge and some of them
are not needed.
  Thank you very much,
  Amir
  
 
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See the colClasses argument of read.table.

e.g.

   read.table("myfile", header = TRUE, colClasses = c(person = NULL))

assuming you don't want the column labelled person in the header.

On 10/30/06, Amir Safari <amsa36060 at yahoo.com>
wrote:
>
>
>    Dear R users,
>  Sometimes it is needed to read only some columns from a table, in 
particulare for high frequency data. How it is possible to read just  some
certain columns using read.table ( ). The reason could be keeping  space in R
and in particular accelerating in reading data when the  number of rows are huge
and some of them are not needed.
>  Thank you very much,
>  Amir
>
>
> ---------------------------------
>
>        [[alternative HTML version deleted]]
>
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