MATLAB: In a column how to find the first cell to equal 0

cell referencezeros

I have this code so far:
for i = 7:length(mydata)
   index = find (mydata{i,1}(:,5))== 0
end
However, this returns all the zeros in the whole matrix, I require a cell reference in column 5 as to when the first 0 occurs.

Best Answer

Run this
    ixc = 3; % third column
    sample_array = num2cell( magic(4)-3 );
    is = cell2mat( sample_array( :, ixc ) ) == 0;
    >> sample_array
    sample_array = 
        [13]    [-1]    [ 0]    [10]
        [ 2]    [ 8]    [ 7]    [ 5]
        [ 6]    [ 4]    [ 3]    [ 9]
        [ 1]    [11]    [12]    [-2]
    >> is
    is =
         1
         0
         0
         0
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