[英]R: extract info from the data frame with row names
I want to extract specific information from the data frame, but can't extract row names too. 我想从数据框中提取特定信息,但也不能提取行名。
My dummy example: 我的虚拟示例:
dummy <- as.data.frame(matrix(c(34,11,9,32,23,13), ncol=2))
colnames(dummy) <- c('C1', 'C2')
rownames(dummy) <- c('Row1', 'Row2', 'Row3')
dummy
C1 C2
Row1 34 32
Row2 11 23
Row3 9 13
I want to extract C2
from the dummy
. 我想从
dummy
提取C2
。 I tried: 我试过了:
dummy$C2
[1] 32 23 13
as.data.frame(dummy$C2)
dummy$C2
1 32
2 23
3 13
subset(dummy)$C2
[1] 32 23 13
How can I extract row names too, for the result like this: 我也如何提取行名,结果如下:
dummy_extracted
Row1 32
Row2 23
Row3 13
Try 尝试
dummy[, "C2", drop = FALSE]
C2
Row1 32
Row2 23
Row3 13
With ?subset() 用?subset()
subset(dummy, select=C2)
C2
Row1 32
Row2 23
Row3 13
If you look at the documentation of ?subset(), by default: 如果您查看?subset()的文档,则默认情况下:
## S3 method for class 'data.frame'
subset(x, subset, select, drop = FALSE, ...)
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