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function calc_error(name, data, pred)
quad = quad_error(data, pred);
total = total_error(data, pred);
printf('%9s quad: %9d\n', name, quad);
printf('%9s total: %9d\n', name, total);
xlabel('products');
ylabel('total error');
plot((sum(abs(data - pred))), '-ob;unsorted;');
hold on;
plot(sort(sum(abs(data - pred))), '-or;sorted;');
hold off;
end
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