Replacing zeros with other values

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Mido
Mido 2016-11-3
评论： KSSV 2016-11-4
A=[1 2 3 4;
4 5 0 0;
1 0 0 1;
0 1 1 1]
I want to replace zeros in the third column with last known values. The result should be
A=[1 2 3 4;
4 5 3 0;
1 0 3 1;
0 1 1 1]
What should be the code.

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KSSV
KSSV 2016-11-4
A3=A(:,3);
A3(A3==0)=3;
A(:,3)=A3;
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Mido
Mido 2016-11-4
I have one more question. If I have a matrix like this
A= [1 1;
1 2;
1 3;
1 4;
2 1;
2 2;
2 3;
2 4]
I want to extract rows from the matrix as follows: For each different number in the first column extract rows using increment of 2 in the second column. The result will be:
A= [1 2;
1 4;
2 2;
2 4]

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