R help - Aug 2012 - How should one handle "NA" properly in a .csv dataset?

Hi,

   I am reading several .csv file of time series. Some values of the time
series are unavailable. Some of the unavailable series are marked
"NA", and
some are just blank. The "NA" value can be read, but the blank cannot
be
read. Then I change the change the blank to "NA", but they can't
be
properly read.

   When I check the difference between the two types of "NA", I find:

   Those can be read are outputed as  "NA".
   Those can't be read (which I change from the blank) are outputed as
"<NA>".

   Could anyone tell me how I can input the NA properly?

   Thanks,

Miao

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Hi,

   I find the problem. Some of the numbers like "1357" are presented
as
"1,357". After deleting the comma, everything is ok. Thank you for
your
attention!

Miao

2012/8/22 jpm miao <miaojpm@gmail.com>
> Hi,
>
>    I am reading several .csv file of time series. Some values of the time
> series are unavailable. Some of the unavailable series are marked
"NA", and
> some are just blank. The "NA" value can be read, but the blank
cannot be
> read. Then I change the change the blank to "NA", but they
can't be
> properly read.
>
>    When I check the difference between the two types of "NA", I
find:
>
>    Those can be read are outputed as  "NA".
>    Those can't be read (which I change from the blank) are outputed as
> "<NA>".
>
>    Could anyone tell me how I can input the NA properly?
>
>    Thanks,
>
> Miao
>
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