Dealing with NA's and NaN's.
# S4 method for ddmatrix na.exclude(object, ..., ICTXT)
numeric distributed matrix
optional BLACS context number for output
Removes rows containing NA's and NaN's.
The function relies on reblocking across different BLACS contexts. The input distributed matrix will be redistributed along context 1, where extracting/deleting rows does not destroy block-cyclicality.
Only advanced users should supply an
ICTXT value. Most should simply
leave this argument blank.
The context of the return is dependent on the function arguments. If the
ICTXT= argument is missing, then the return will be redistributed
across its input context
object@ICTXT. Otherwise, the return will be
redistributed across the supplied