finding coordinates of matching points

function num=match(im1,im2)
        [im1,des1,loc1]=sift('img13.pgm');
        [im2,des2,loc2]=sift('img14.pgm');
        distRatio=0.65;
        des2t =des2';
        for i = 1 : size(des1,1)
           dotprods = des1(i,:) * des2t; 
           [vals,indx] = sort(acos(dotprods));
           if (vals(1) < distRatio * vals(2))
               match(i) = indx(1);
           else
               match(i) = 0;
           end
        end
        im3 = appendimages(im1,im2);
        figure('Position', [100 100 size(im3,2) size(im3,1)]);
        colormap('gray');
        cols1 = size(im1,2);
        imshow(im3);
        for i = 1: size(des1,1)
            if (match(i) > 0)
                line([loc1(i,2) loc2(match(i),2)+cols1], ...
                    [loc1(i,1) loc2(match(i),1)], 'Color', 'c');
            end
        end
        hold off
        num = sum(match >0);
     fprintf('Found %d matches.\n', num);

I WANT TO FIND THE COORDINATES OF MATCHING POINTS OF TWO IMAGES.I M GETTING THE MATCHING POINTS IN IMAGE.above is my code.kindly some one help me to find the coordinates of the matching points