[R] na.omit - Is it working properly?

[P Ehlers]

Kalicin, Sarah wrote:
\begin{quote}
I have a work around for this, but can someone explain
why the first example does not work properly?
I believed it worked in the previous version of R,
by selecting just the rows=200525 and omitting the na's.
\end{quote}

You can prove this statement by providing reproducible
code that we can test.

Peter Ehlers

I just upgraded to 2.13. I am also concern with the row numbers being 
different in the selections, should I be worried? FYI, I just selected 
the first few rows for demonstration, please do not worry that the 
number of rows shown are not equal. - Sarah
> 
> With na.omit around the column, but it is showing other values in the F.WW column other than 200525, along with NA.  I was hoping that this would omit all the NA's, and show all the rows that P$F.WW=200525. I believe it did with the previous version of R.
> P[na.omit(P$F.WW)==200525, c(51, 52)]
>           F.WW        R.WW
> 45      200525          NA
> 53          NA          NA
> 61      200534      200534
> 63      200608      200608
> 66      200522      200541
> 80          NA          NA
> 150     200521      200516
> 231     200530      200530
> 
> No na.omit, the F.WW=200525 seems to work, but lots of NA included. This is what is expected!! The row numbers are not the same as the above example, except the first row.
>> P[P$F.WW==200525, c(51, 52)]
>             F.WW     R.WW
> 45        200525          NA
> NA            NA          NA
> NA.1          NA          NA
> NA.2          NA          NA
> NA.3          NA          NA
> 57        200525      200526
> 65        200525          NA
> 67        200525          NA
> 70        200525      200525
> NA.4          NA          NA
> NA.5          NA          NA
> 86        200525          NA
> 
> Na.omit excludes the na's. This is what I want. The concern I have is why the row numbers do not match any of those shown in the examples above.
>> na.omit(P[P$F.WW==200525, c(51, 52)])
>         F.WW        R.WW
> 57    200525      200526
> 70    200525      200525
> 161   200525      200525
> 245   200525      200525
> 246   200525      200525
> 247   200525      200526
> 256   200525      200525
> 266   200525      200525
> 269   200525      200525
> 271   200525      200526
> 276   200525      200526
> 278   200525      200526
> 
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