[R] how to sort

[onyourmark]

Hi. I have an object. I think it is a list.

> str(corTFandPCA)
 num [1:922, 1:5] -0.0226 -0.0504 -0.0208 -0.0582 -0.0257 ...
 - attr(*, "dimnames")=List of 2
  ..$ : chr [1:922] "abdomen.2" "abdomimal.3" "abdominal.4" "aberration.5"
...
  ..$ : chr [1:5] "PC1" "PC2" "PC3" "PC4" ...

I want to order it according to PC1.

I tried this

 dfCorTFandPCA=as.data.frame(corTFandPCA)
> orderedCorTFandPCA=dfCorTFandPCA[order(PC1)]
Error in order(PC1) : object 'PC1' not found

but get that error. Can someone tell me what the best way to do this is?
Thank you.
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