MATLAB: Three level indexing and nested if statements

if statementindexing

I have an index with three conditions, one condition in each column. I want to create a master index with one column for classifications which incorporate all three columns of the previous index. I did this successfully with two conditions but can't figure out how to add the third. I include the code that works and my attempt to change it.
for i = 1:length(DEFcomboIDX)
    if DEFcomboIDX(i,1) % Type 1 SN        %If comboIDX column 1 = 1 then Type 1

        if ~DEFcomboIDX(i,2)               % If comboIDX column 2 =0 then SN

            DEFindex(i,1) = 1;             % mark it with a 1

        elseif DEFcomboIDX(i,2) % Type 1 VTA 

            DEFindex(i,1) = 2;             % if comboIDX column 2 = 1 then VTa; Mark with a 2

        end
    elseif ~DEFcomboIDX(i,1) % Type 2 SN  

        if ~DEFcomboIDX(i,2)
            DEFindex(i,1) = 3;
        elseif DEFcomboIDX(i,2) % Type 2 VTA 

            DEFindex(i,1) = 4;
        end
    end
end
and what i'm trying now:
for i = 1:length(DEFcomboIDX)
    if DEFcomboIDX(i,1) % Type 1 SN        %If comboIDX column 1 = 1 then Type 1
        if ~DEFcomboIDX(i,2)                % If comboIDX column 2 =0 then SN
            if DEFcomboIDX(i,3)
                DEFindex(i,1) = 1;             % mark it with a 1
        elseif DEFcomboIDX(i,2) % Type 1 VTA 
            if DEFcomboIDX(i,3)
            DEFindex(i,1) = 2;             % if comboIDX column 2 = 1 then VTa; Mark with a 2
        end
    elseif ~DEFcomboIDX(i,1) % Type 2 SN  
        if ~DEFcomboIDX(i,2)
           if DEFindex(i,1) = 3;
        elseif DEFcomboIDX(i,2) % Type 2 VTA 
            DEFindex(i,1) = 4;
        end
            end
        end
        end
    end
end

Best Answer

In your first code, the elseif for Type 2 SN is matched with the if for Type 1 SN . In your second code, the elseif for Type 2 SN is matched with the if for Type 1 VTA. I think you are missing an "end"
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