Sparse arrays are powerful, fast and very useful in J. However the absence
of the ability to box them means that programs that use them need to follow
a quite different set of design rules, the common usage of a list of boxed
items as an argument avoided, and intermediate results handled in different
ways.
Given that it was not implemented earlier I suspect there are major problems
in doing so. However I wonder if Roger could give us some indication of
when monadic < might be added to the implementation status for this valuable
data type.
Fraser
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