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x = -2:0.001:2;

a = 5; b = 1;
y1 = a*x + b*x.^2;
legend1 = sprintf('y1 , nl_c = %g',b/a);

a = 2; b = 1;
y2 = a*x + b*x.^2;
legend2 = sprintf('y2 , nl_c = %g',b/a);

a = 0.1; b = 1;
y3 = a*x + b*x.^2;
legend3 = sprintf('y3 , nl_c = %g',b/a);

plot(x,y1,x,y2,x,y3)
legend(legend1,legend2,legend3)






