[R] Problem dropping rows based on values in a column

[Wensui Liu]

> jdata
    PID
1 14854
2 10481
3 14793
4 14744
5 14772
> jdata[jdata[1] != delete, 1]
[1] 14854 10481 14793


On 3/25/07, John Sorkin <jsorkin at grecc.umaryland.edu> wrote:
> I am trying to drop rows of a dataframe based on values of the column PID, but my strategy is not working. I hope someoen can tell me what I am doing incorrectly.
>
>
> # Values of PID column
> > jdata[,"PID"]
>  [1] 16608 16613 16355 16378 16371 16280 16211 16169 16025 11595 15883 15682 15617 15615 15212 14862 16539
> [18] 12063 16755 16720 16400 16257 16209 16200 16144 11598 13594 15419 15589 15982 15825 15834 15491 15822
> [35] 15803 15795 10202 15680 15587 15552 15588 15375 15492 15568 15196 10217 15396 15477 15446 15374 14092
> [52] 14033 15141 14953 15473 10424 13445 14854 10481 14793 14744 14772
>
> #Prepare to drop last two rows, rows that ahve 14744 and 14772 in the PID column
> > delete<-c(14772,14744)
>
> #Try to delete last two rows, but as you will see, I am not able to drop the last two rows.
> > jdata[jdata$PID!=delete,"PID"]
>  [1] 16608 16613 16355 16378 16371 16280 16211 16169 16025 11595 15883 15682 15617 15615 15212 14862 16539
> [18] 12063 16755 16720 16400 16257 16209 16200 16144 11598 13594 15419 15589 15982 15825 15834 15491 15822
> [35] 15803 15795 10202 15680 15587 15552 15588 15375 15492 15568 15196 10217 15396 15477 15446 15374 14092
> [52] 14033 15141 14953 15473 10424 13445 14854 10481 14793 14744 14772
> >
>
>
> Thanks,
> John
>
> John Sorkin M.D., Ph.D.
> Chief, Biostatistics and Informatics
> Baltimore VA Medical Center GRECC,
> University of Maryland School of Medicine Claude D. Pepper OAIC,
> University of Maryland Clinical Nutrition Research Unit, and
> Baltimore VA Center Stroke of Excellence
>
> University of Maryland School of Medicine
> Division of Gerontology
> Baltimore VA Medical Center
> 10 North Greene Street
> GRECC (BT/18/GR)
> Baltimore, MD 21201-1524
>
> (Phone) 410-605-7119
> (Fax) 410-605-7913 (Please call phone number above prior to faxing)
> jsorkin at grecc.umaryland.edu
>
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-- 
WenSui Liu
A lousy statistician who happens to know a little programming
(http://spaces.msn.com/statcompute/blog)