Dear all,

I have a task to find the first all zero row of a matrix X ( nothing known
about X). I need to write a function which returns either the row index of
the first all-zero row, or NA if there are no all-zero rows. and I also need
to locate all rows which are non-zero (should be a vector of row indexes).

Can somebody give me some hints on this?

Thanks a lot.

Rene.

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