MATLAB: Insert zero in chosen column of matrix randomly

insert zero in chosen column of matrix randomly

I have
A=[
     1     2     1     4
     3     4     1     4
     4     5     1     5
     5     7     1     6
     7     9     1     9];
I want to put zero for only one entery in column 3 randomly.
result shoud be 
A=[
     1     2     0     4
     3     4     1     4
     4     5     1     5
     5     7     1     6
     7     9     1     9];
 or
 A=[
     1     2     1     4
     3     4     1     4
     4     5     0     5
     5     7     1     6
     7     9     1     9];
 or 
 
 A=[
     1     2     1     4
     3     4     1     4
     4     5     1     5
     5     7     1     6
     7     9     0     9];

Best Answer

ix = 1:2:size(A,1);
A(ix(randi(numel(ix),1)),3)=0
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