R help - Apr 2006 - what happen?

Hi!
I want to choose part of the data. But it has a question.
> attach(PIKO)
> PIKO[1:5,]
     code species  dbh     x     y   tag status branch
92  10142    PIKO 38.9  6.05 12.81 10165  alive      0
109 10213    PIKO 41.0  6.71 26.21 10202  alive      0
135 10222    PIKO 48.3 18.98 21.28 10214  alive      0
146 10223    PIKO 47.0 19.45 22.83 10224  alive      0
147 10223    PIKO 20.0 19.74 28.65 10225  alive      0
> n=PIKO[dbh>=25,]
> n[1:5,]
     code species  dbh     x     y   tag status branch
92  10142    PIKO 38.9  6.05 12.81 10165  alive      0
109 10213    PIKO 41.0  6.71 26.21 10202  alive      0
135 10222    PIKO 48.3 18.98 21.28 10214  alive      0
146 10223    PIKO 47.0 19.45 22.83 10224  alive      0
152 10223    PIKO 33.5 16.94 27.25 10230  alive      0
*> n=PIKO[status="snag",]
Error in "[.data.frame"(PIKO, status = "snag", ) :
        unused argument(s) (status ...)
*

	[[alternative HTML version deleted]]

Look at: ?Comparison; you need:

PIKO[status == "snag", ]


Best,
Dimitris

----
Dimitris Rizopoulos
Ph.D. Student
Biostatistical Centre
School of Public Health
Catholic University of Leuven

Address: Kapucijnenvoer 35, Leuven, Belgium
Tel: +32/(0)16/336899
Fax: +32/(0)16/337015
Web: http://www.med.kuleuven.be/biostat/
     http://www.student.kuleuven.be/~m0390867/dimitris.htm


----- Original Message ----- 
From: "zhang jian" <jzhang1982 at gmail.com>
To: "r-help" <r-help at stat.math.ethz.ch>
Sent: Tuesday, April 18, 2006 4:45 PM
Subject: [R] what happen?

> Hi!
> I want to choose part of the data. But it has a question.
>
>> attach(PIKO)
>> PIKO[1:5,]
>     code species  dbh     x     y   tag status branch
> 92  10142    PIKO 38.9  6.05 12.81 10165  alive      0
> 109 10213    PIKO 41.0  6.71 26.21 10202  alive      0
> 135 10222    PIKO 48.3 18.98 21.28 10214  alive      0
> 146 10223    PIKO 47.0 19.45 22.83 10224  alive      0
> 147 10223    PIKO 20.0 19.74 28.65 10225  alive      0
>> n=PIKO[dbh>=25,]
>> n[1:5,]
>     code species  dbh     x     y   tag status branch
> 92  10142    PIKO 38.9  6.05 12.81 10165  alive      0
> 109 10213    PIKO 41.0  6.71 26.21 10202  alive      0
> 135 10222    PIKO 48.3 18.98 21.28 10214  alive      0
> 146 10223    PIKO 47.0 19.45 22.83 10224  alive      0
> 152 10223    PIKO 33.5 16.94 27.25 10230  alive      0
> *> n=PIKO[status="snag",]
> Error in "[.data.frame"(PIKO, status = "snag", ) :
>        unused argument(s) (status ...)
> *
>
> [[alternative HTML version deleted]]
>
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zhang jian wrote:
> *> n=PIKO[status="snag",]
> Error in "[.data.frame"(PIKO, status = "snag", ) :
>         unused argument(s) (status ...)
"=" is the assignment operator, you should use "==" as in:
n=PIKO[status=="snag",]

		
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