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 ...)
*

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