MATLAB: Why this program showing error like undefined variable.?..one day before same program was giving results but now it os showing error.please help

undefined variable

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)

Best Answer

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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