Find the index of the last non-zero element in each row of a given matrix?

Question

For an arbitrary sized matrix x, how do I find the index of the last non-zero element in each row of a given matrix?

For example, for the matrix

Answer 1

Here's one version:

x = [ 0 9 7 0 0 0; 5 0 0 6 0 3; 0 0 0 0 0 0; 8 0 4 2 1 0 ];
c = arrayfun(@(k) find(x(k,:)~=0,1,'last'), 1:size(x,1), 'UniformOutput',false);
c( cellfun(@isempty,c) ) = {0};
v = cell2mat(c);

v =
     3     6     0     5

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EDIT: Consider this alternative solution:

[m,v] = max( cumsum(x'~=0) );
v(m==0) = 0;

v =
     3     6     0     5