One approach to such a problem would be to use a logical vector inside
the function colSums.
?colSums
> DF <- data.frame(XX= runif(20), YY=runif(20))
> colSums(DF > 0.5)
XX YY
11 9
> colSums(DF > -Inf)
XX YY
20 20
>
> colSums(DF> 0.5)/colSums(DF > -Inf) #could have used DF >= min(DF)
in t
On Wed, 28 Jan 2009, Mark Na wrote:
Hi R-helpers,
I've been struggling with a problem for most of the day (!) so am finally
resorting to R-help.
I would like to subset the columns of my dataframe based on the frequency
with which the columns contain non-zero values. For example, let's say that
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