On Nov 21, 2012, at 7:32 AM, Brian Feeny wrote:
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
c(-1, 1)[ 1+(value > 127.5) ]
I suspect most will find this less intuitive than `ifelse`, but I find
it useful when picking colors or other values from a vector,
expecially when the argument is built with findInterval, e.g.
c(-1, 1)[ findInterval(value, c(0, 127.5, 255) ) ] Which generalizes
much more compactly to multiple intervals than does ifelse.
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.
--
David Winsemius, MD
Alameda, CA, USA
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