why this program showing error like undefined variable.?..one day before same program was giving results but now it os showing error.please help
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Pc=620*10^6
Pa=62*10^9
Ps=1*10^9
r=10
d=1:10:1000
s=(d./r)
s1=s
w1=4.3
E0=8.85*10^-12
Eb=6.830890.*(w1.^(3/2))
A1=d.^2
B1=(d./d0).^(1/3)
l=(Eb./B1)
m= (2.*Pc./E0).^(1/2)
n=(8.*Pa./(E0.*(1+s).^4)).^(1/2)
x1=min(m,n)
Es=min(x1,l)
h=8
l1= 0.5.*E0.*l.^2.*10^18
n1=(4.*Pa)./((1+(s)).^4)
y1=min(l1,Pa)
y2=min(y1,n1)
if s1<=2
e1=1
elseif s1>=2
e1= (s+2)./4
elseif s1>2;
e1=(d./r)./4
end
x1=e1;
A1=d.^2
u=e1.*y2
A2=(A1.*Ps)./u
A=(A1+A2)
x2=(d+h)
Vw=(d.*A1)./(x2.*A)
uw=(u.*Vw)
plot(d,uw)
5 Commenti
Mischa Kim
il 27 Mar 2014
As pointed out above by RAGHAVENDRA, there is no assignment for e1 in the final else
else
e1 = 0; % add some statement to assign a value
end
I strongly suspect that your code jumps right into the else, no value for e1 is assigned, which results in the error message.
Risposta accettata
Joseph Cheng
il 27 Mar 2014
My answer to why it worked one day and not another would be pasted code is a script. The issue with scripts is that if you do not clear the workspace before running it multiple times value may not be cleared. So if it is defined during debugging or in a previous iteration it will still be defined until you close down matlab or clear the workspace.
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