MATLAB: Loop is not reading from the first value in the array

first cell valuefor loop

I have a loop that is transferring data between two arrays, however, I'm not sure why it is not reading from the very first and last values. The first array (arrayA) looks like:
    {'7'}    {'ans'}    {[1]}
    {'7'}    {'ans'}    {[2]}
    {'7'}    {'ans'}    {[3]}
second array (arrayB) looks like:
    {'7'  }    {[101]}    {[1]}
    {'ans'}    {[278]}    {[1]}
    {'7'  }    {[299]}    {[2]}
    {'ans'}    {[300]}    {[2]}
    {'7'  }    {[432]}    {[3]}
    {'ans'}    {[467]}    {[3]}
With the following loop, IF the value in arrayA{a,3} matches that in arrayB{b,3}, i want the FIRST matching value to appear in arrayB{b,4} and the SECOND matching value to appear in arrayB{b,5}.
for a = 1:length(arrayA)
            for b = 1:length(arrayB)
                if arrayA{a,3}==arrayB{b,3}
                    arrayA{a,4} = arrayB{b,2};
                    arrayA{a,5} = arrayB{(b+1),2};
                end
            end
        end
Right now, it looks like:
    {'7'}    {'ans'}    {[1]}    {[278]}    {[299]}
    {'7'}    {'ans'}    {[2]}    {[300]}    {[432]}
    {'7'}    {'ans'}    {[3]}    {[467]}    {[467]}
What I would like however would be:
    {'7'}    {'ans'}    {[1]}    {[101]}    {[278]}
    {'7'}    {'ans'}    {[2]}    {[299]}    {[300]}
    {'7'}    {'ans'}    {[3]}    {[432]}    {[467]}

Best Answer

It is because third column in B has duplicated values. For example, the result of the first loop (b=1) in the "for b = 1:length(arrayB)" loop is over-written by the second loop (b=2)
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