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for i = [30 45]
p = dlmread(sprintf("products/p%03d", i), " ");
day = p(:,1);
quantity = p(:,4);
middle = repmat(mean(p(:,4)), 42, 1);
middle_20 = repmat(mean(p(1:20, 4)), 42, 1);
[m, n] = regress(day, quantity);
f = @(x) m .* x + n;
[m, n] = regress(day(1:20), quantity(1:20));
g = @(x) m .* x + n;
figure
plot(day, p(:,4), "-;quantity;",
day, middle, "-;Mittelwert;",
day, middle_20, "-;Mittelwert 1-20;",
day, f(day), "-;Regression 1-42;",
day, g(day), "-;Regression 1-20;")
endfor
function [m, n] = regress(x, y)
mn = [ x ones(length(x), 1) ] \ y;
m = mn(1);
n = mn(2);
endfunction
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