Replace all zeros in vector by previous non-zero value

Question

Matlab/Octave algorithm example:

 input vector: [ 1 0 2 0 7 7 7 0 5 0 0 0 9 ]
output vector: [ 1 1 2 2 7 7 7 7 5 5 5 5 9 ]

The algorithm is

Answer 1

New in MATLAB R2016b: fillmissing, it does exactly as described in the question:

in = [ 1 0 2 0 7 7 7 0 5 0 0 0 9 ];
in(in==0) = NaN;
out = fillmissing(in,'previous');

[This new functionality discovered in this duplicate question].