length(s) = nnz(A) 
nzmax(A) prod(size(A))
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nonzeros
Nonzero matrix elements
s=nonzeros(A)
s = nonzeros(A)
returns a full column vector of the nonzero elements in A, ordered by columns.
This gives the s, but not the i and j, from [i,j,s] = find(A). Generally,
length(s) = nnz(A)nzmax(A)prod(size(A))
find Find indices and values of nonzero elements
nnz Number of nonzero matrix elements
nzmax Amount of storage allocated for nonzero matrix
elements
size Array dimensions
whos List directory of variables in memory
isa Detect an object of a given class