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x1=0:0.001:2;y1=x1.^2;x2=2:0.001:5;y2=x2.^2; plot(x1,y1,'r-',x2,y2,'b')
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x1=0:0.001:2;y=x1.^2;
plot(x1,y,'r-') ;
hold on;
x2=2:0.001:5;y=x2.^2;
plot(x2,y,'b') ;

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