why is this program keep telling me this error: Unable to perform assignment because the left and right sides have a different number of elements.

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Pablo Zarco 2021-1-27

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回答： David Hill 2021-1-27

clear;clc;

V=[1 2 3 4];

A=3;

%preallocation

C=zeros(1,numel(V));

xSol=zeros(1,numel(V));

ySol=zeros(1,numel(V));

for i=1:numel(V)

C(i)=V(i)-A;

syms x y

eqn1=C(i)*x+y==2;

eqn2=-x+y==3;

sol=solve([eqn1 eqn2],[x y]);

xSol(i)=double(sol.x);

ySol(i)=double(sol.y);

end

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Mathieu NOE 2021-1-27

hello

at which line do you get the error ?

what is the error message in the command window ?

Pablo Zarco 2021-1-27

This is the message in the command window

Unable to perform assignment because the left and right sides have a different number of elements.

Error in Untitled2 (line 14)

xSol(i)=double(sol.x);

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Answer 1

David Hill 2021-1-27

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https://ww2.mathworks.cn/matlabcentral/answers/728718-why-is-this-program-keep-telling-me-this-error-unable-to-perform-assignment-because-the-left-and-r#answer_607758

在 MATLAB Online 中打开

I would avoid symbolic if you can

V=[1 2 3 4];
A=3;
Sol=zeros(2,length(V));
for i=1:length(V)
    Sol(:,i)=[V(i)-A,1;-1,1]\[2;3];
end

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