[R] Conditionally swap two columns of a data.frame?

Dan Bolser dmb at mrc-dunn.cam.ac.uk
Thu Sep 16 14:19:26 CEST 2004

I am doing this a kinda dumb way, and it is apparetnly taking

I have a data frame with two numeric columns. I want to look at their
correlation, and I am looking at the size ratio between the two. 



This kinda gives me a normal curve showing something about the
distribution of the two values.

I want to make sure that V1/V2 is always > 1 ...

for (i in 1:length(row.names(data)) ){
  ratioV1V2 <- if(V1>V2) V1/V2 else V2/V1

This is a bit of a hack, and is taking forever for some reson (about
40,000 rows in my data.frame).

I would just like to swap the values in the data frame (to put the bigest
first for example), then use the above plot to get what I want.

Should I use the DB backend to the data to make the dump in this way?
(involves some hacky sql)

Considering I am interested in the range of the ratio between V1 and V2,
should I be looking at doing a different analysis?

I am so dumb, any help is appreciated,


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