MATLAB: How to replace NaN elements with the nearest value in the same column

nanreplace

I am trying to replace NaN's in a vector field with the nearest value.
 % I have:
M=
NaN  12
18   14
NaN  NaN
NaN  NaN
NaN  16
12   NaN
12   NaN
NaN  12
16   NaN
 %I desire:
M=
18   12
18   14
12   16
12   16
12   16
12   12
12   12
16   12
16   12
Any information will be helpful. Thank you

Best Answer

FIXED 2
m = flipud(M)
t = ~isnan(m);
ii = cumsum(t);
ii(ii == 0) = 1;
ii = bsxfun(@plus,[0,ii(end,1:end-1)],ii);
m1 = m(t);
out = flipud(m1(ii))
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