Return true if only one element in matrix is nonzero

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Darlington Mensah
回答： Guillaume 2018-5-8
How do I find out if my matrix contains only one non-zero element and return true, if not false.
Such that
0 0 0
0 0 0
0 0 0
should return FALSE(all element are zero)
0 0 0
0 0 1
0 0 1
should return FALSE(more than one element is non-zero)
And finally;
0 0 0
0 0 0
0 0 1
should return TRUE
I could use a for loop but i was wondering if there is any function that can do that

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Guillaume
Guillaume 2018-5-8
nnz(yourmatrix) == 1

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