While running the code, I am getting error expression as, 'The expression to the left of the equals sign is not a valid target for an assignment'.

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shunmugam hemalatha 2020-6-18

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https://ww2.mathworks.cn/matlabcentral/answers/550503-while-running-the-code-i-am-getting-error-expression-as-the-expression-to-the-left-of-the-equals

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clc
clear all
syms q  TOT
D=1000;
P=3200;
S=400;
A0=25;
Cv=20;
Cb=25;
Rc=3;
Cs=30;
MUv=0.2;
MUb=0.2;
sigma=7;
k=2.33;
L0=8;
Gamma=0.05;
Delta=5;
is=0.02;
iv=0.02;
ic=0.06;
M=0.1;
Z(L)=0;
n=1;
L=8;
Alpha=20;
Beta=0.6250;
q=0;
for i=1:10
    q=sqrt(((2*D)*((Alpha+Beta*ln(L))+(s/n)+Z(L)+((D*M^2)/2)*(Cb*ic-Cs*is)))/((MUb*Cb)+(MUv*Cv)*(n*(1-(D/P))-1+((2*D)/P))))
    TOT=(D/q)*((Alpha+Beta*ln(L))+(s/n)+Z(L)+((D*M^2)/2)*(Cb*ic-Cs*is))+(q/2)*((MUb*Cb)+(MUv*Cv)*(n*(1-(D/P)-1+((2*D)/P)+(Cb*ic))+(MUb*Cb*k*sigma*sqrt(L))=(Rc*Gamma*D)+(Cb*D*M*(im-ic))
end

The answer is q=332, TOT=3240.

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shunmugam hemalatha 2020-6-18

I have corrected the mistake that you have pointed. But i don't know how to enter the data Z(L). Still the error shows that (Undefined function or variable 'L')

Z(L)=0;

madhan ravi 2020-6-18

Why is there a loop ??

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Answer 1

Aayush Shah 2020-6-18

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Hi Shunmugam,

My understanding of your question is that you are getting an error while assigning a value after doing the computations. The reason for it is that you’re using two assignment (=) operators in a single line. The ‘=’ sign at col 156(i.e., before ‘Rc’) is wrong. Another error you might encounter after changing the above code is from this line:

Z(L)=0; 
n=1;  
L=8;

You will get an error because you’re trying to use the value of ‘L’ before assigning it any value. Interchange the lines and your issue would be solved.