[R] how to get the row name?

[Ionut Florescu]

I don't know about rownames but
x >= 0 gives you a vector of logical values True and false.
If then you do
c(1:length(x)) [x>=0]
this gives the positions where the true happened, meaning your vector of
values.



Chuck Cleland wrote:
> rownames(subset(mydata, X >=0))
>
> ?rownames
>
> Leaf Sun wrote:
>   
>> Hi R-listers,
>>
>> I have a simple question about a data frame.  
>>
>> I sorted a data set by one of the variable in some condition (eg. X>=0),  the followed is part of the achieved. I was wondering how can I get the row name, i. e.   (1202,  2077 , 2328,  3341,...  ) and save them as a vector.     Thanks!
>>
>> 			  Tag  Species     X     Y Dbh3 Recr4 mort slope elevation aspect    SA   SR     dist1     dist2     dist3
>> 1202    19103     316 856.0 430.3   21     4    1  9.87    151.42  60.08 25.38 1.02 0.2236068 0.7211103 1.3601471
>> 2077    29893     316 935.4 482.7   28     4    1  5.66    137.28  13.86 25.14 1.01 0.6403124 0.8944272 1.0630146
>> 2328    32989     316 910.7 301.5   12     4    1  8.07    137.69  86.16 25.26 1.01 0.3000000 1.2806248 1.3038405
>> 3341    45198     316 975.2   2.4  144     4    1  2.95    121.10 173.60  0.00 0.00 0.5656854 1.2727922 1.3416408
>> ...
>>
>> Regards,
>>
>> Leaf
>>
>>
>>
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>
>   
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