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Why Does eig() Not Throw an Error for Non-Square, Symbolic Input?

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Paul
Paul on 19 May 2021
Commented: Paul on 28 May 2021
Example:
M = [sym(zeros(2));sym('m',[2 2])];
M(1,1) = 1
M = 
eig(M)
ans = 
But filling in the top partition of M does yield the expected result:
M(1:2,1:2) = sym('n',[2 2])
M = 
eig(M)
Error using sym/eig (line 51)
Matrix must be square.
Bug?

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