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why i am not getting the plot while giving the following program with if else statyement?please help

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an
an 2014-3-6
关闭： MATLAB Answer Bot 2021-8-20
r=10; d=[1 100 1000]; P1=10^9; P2=130*10^9; s=d./r;
a=0; c=2; x=s; if (a<=x<=2); e1=1; else if (x>=2); e1=((d./r)+2)./4; else if (x>2); e1=(d./r)./4; end end end
u=e1.*P1; ug=e1.*P2; plot(d,u,'green') hold; plot(d,ug ,'red');

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Chandrasekhar
Chandrasekhar 2014-3-6
r=10; d=[1 100 1000]; P1=10^9; P2=130*10^9; s=d./r;
a=0; c=2; x=s;
if (a<=x<=2)
e1=1;
else if (x>=2)
e1=((d./r)+2)./4;
else if (x>2)
e1=(d./r)./4;
end
end
end
u=e1.*P1;
ug=e1.*P2;
plot(d,u,'green')
hold;
plot(d,ug ,'red');

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