Zhang Jian wrote:> I find one row in my large dataset. But when I use the "rownames"
for the
> data on the 100,000 row, the result show nothing.
> I try it by the following example, it still likes that.
>
>> tst[rownames(tst)==100000,]
> [1] x y
> <0 rows> (or 0-length row.names)
>
> ##############
>
>> tst=data.frame(x=1:200000,y=200000:1)
>> tst[rownames(tst)==1,]
> x y
> 1 1 200000
>> tst[rownames(tst)==10000,]
> x y
> 10000 10000 190001
>> tst[rownames(tst)==100000,]
> [1] x y
> <0 rows> (or 0-length row.names)
>> tst[100000,]
> x y
> 100000 100000 100001
>
> Is it a bug for R?
No, it's your use of a non-character rowname, viz
> tst[rownames(tst)=="100000",]
x y
100000 100000 100001
Hints:
> 1000
[1] 1000
> 100000
[1] 1e+05
> options(scipen=10)
> tst[rownames(tst)==100000,]
x y
100000 100000 100001
Perhaps R should do a bit less coercing.
-Peter Ehlers
>
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--
Peter Ehlers
University of Calgary