MATLAB: Saving indexs from matlab mfile

I have an m.file which calculates nearest distance. in the end i am getting one matrix with value. But i do not want values i want only index of this values. how to save it??
function [ res ] = GNN(Original_data, Measured_data, Gate)
res=nan(size(Original_data));
for iy = 1:size(Original_data,2)
    localMeasured_data = Measured_data;
 for ix = 1:size(Original_data,1)
    localMeasured_data(ix,isnan(localMeasured_data(ix,:)))=0; %end;
    less = find(localMeasured_data(ix,:) < (Original_data(ix,iy) - Gate));
    more = find(localMeasured_data(ix,:) > (Original_data(ix,iy) + Gate));
    if ~isempty(less)
        localMeasured_data(ix,less) = NaN;
    end
    if ~isempty(more)
        localMeasured_data(ix,more) = NaN;
    end  
    [~,id]= min(abs(localMeasured_data(ix,:)-Original_data(ix,iy)));  %%%i want to save this ids in a matrix
    res(ix,iy) = localMeasured_data(ix,id);
 end
end
end

Best Answer

function [ res,iwant ] = GNN(Original_data, Measured_data, Gate)
res=nan(size(Original_data));
iwant =  zeros(size(Original_data,1),1) ;
for iy = 1:size(Original_data,2)
    localMeasured_data = Measured_data;
 for ix = 1:size(Original_data,1)
    localMeasured_data(ix,isnan(localMeasured_data(ix,:)))=0; %end;
    less = find(localMeasured_data(ix,:) < (Original_data(ix,iy) - Gate));
    more = find(localMeasured_data(ix,:) > (Original_data(ix,iy) + Gate));
    if ~isempty(less)
        localMeasured_data(ix,less) = NaN;
    end
    if ~isempty(more)
        localMeasured_data(ix,more) = NaN;
    end  
    [~,id]= min(abs(localMeasured_data(ix,:)-Original_data(ix,iy)));  %%%i want to save this ids in a matrix
    iwant(ix) = id ;
    res(ix,iy) = localMeasured_data(ix,id);
 end
end
end
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