Аппроксимировать несколько векторов и построить график

p1 = polyfit(X1, Y,80)
p3 = polyfit(X1, Y, 200)
p5 = polyfit(X1, Y, 300)
xx = linspace(X1(1), X1(end), 300);
yy1 = polyval(p1, xx);
yy3 = polyval(p3, xx);
yy5 = polyval(p5, xx);
figure
subplot(4,1,1);
plot(X1, Y, 'o', xx, yy1, xx, yy3, xx, yy5)
p11 = polyfit(X2, Y,80)
p33 = polyfit(X2, Y, 300)
p55 = polyfit(X2, Y, 200)
xx1 = linspace(X2(1), X2(end), 300);
yy11 = polyval(p11, xx1);
yy33 = polyval(p33, xx1);
yy55 = polyval(p55, xx1);
subplot(4,1,2);
plot(X2, Y, 'o', xx1, yy11, xx1, yy33, xx1, yy55)
p111 = polyfit(X3, Y,10)
p333 = polyfit(X3, Y, 30)
p555 = polyfit(X3, Y, 40)
xx2 = linspace(X3(1), X3(end), 300);
yy111 = polyval(p111, xx2);
yy333 = polyval(p333, xx2);
yy555 = polyval(p555, xx2);
subplot(4,1,3);
plot(X3, Y, 'o', xx2, yy111, xx2, yy333, xx2, yy555)
p1111 = polyfit(X4, Y,100)
p3333 = polyfit(X4, Y, 300)
p5555 = polyfit(X4, Y, 40.)
xx3 = linspace(X4(1), X4(end), 900);
yy111 = polyval(p1111, xx3);
yy333 = polyval(p3333, xx3);
yy555 = polyval(p555, xx3);
subplot(4,1,4);
plot(X3, Y, 'o', xx3, yy1111, xx3, yy3333, xx3, yy5555)