Avoiding "for" loops with "apply" is one thing ...
But can one avoid using apply? and gain even more efficiency?
e.g.
instead of
for (i in 1:(ncol(x)-1)) y[i] = mean(x[,i:(i+1)])
can be replaced with
y = sapply(1:(ncol(x)-1), FUN=function(i) { mean(x[,i:(i+1)]) } )
but how can apply be avoided to gain efficiency in this case?
in any case?
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