Calculates the median for each row in a matrix.
The implementation of
is optimized for both speed and memory.
To avoid coercing to
doubles (and hence memory
allocation), there is a special implementation for
integer matrices. That is, if
x is an
rowMedians(as.double(x)) would require three times the memory
rowMedians(x), but all this is avoided.
Missing values are excluded before calculating the medians.
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