[R] remove data frame from list of data frames

[Matthew Finkbeiner]

I have a list of data frames like this:

a<- data.frame(x=runif(10), y = runif(10), Acc = 1)
b<- data.frame(x=runif(10), y = runif(10), Acc = 0)
ls<- list(a,b)

and I want to remove the data frames from ls that have Acc values other than 1.

How do I do that?

Thanks for any help!

Matthew