[R] Scaling values 0-255 -> -1 , 1 - how can this be done?

[Brian Feeny]

I have a dataframe in which I have values 0-255, I wish to transpose them such that:

if value  > 127.5 value = 1
if value < 127.5 value = -1

I did something similar using the "binarize" function of the biclust package, this transforms my dataframe to 0 and 1 values, but I wish
to use -1 and 1 and looking for a way in R to do this.

Brian