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cumbersume
2010 Mar 29
1
Suggestion: Adding quick rowMin and rowMax functions to base package
...t
calculate the min or max over rows / cols in a matrix. While
apply(x,1,min) works, I found out by profiling a program of mine that it
is rather slow for matrices with a very large number of rows. A quick
functionality seems to be already there in the functions pmax and pmin,
but it is rather cumbersume to apply them to all columns of a matrix (if
one does not know how many columns the matrix has). Below, I have some
code that shows a very unelegant implementation that illustrates
possible speed gains if apply could be avoided:
rowMin = function(x) {
# Construct a call pmin(x[,1],x[,2],....