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

[John Sorkin]

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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