Why do I receive an error with FZERO on a vector-valued function in MATLAB?

MathWorks Support Team

2013 9 24

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I am trying to use FZERO on a vector valued function and I receive the following error:

ERROR: ??? Operands to the || and && operators must be convertible to logical scalar
values.
Error in ==> fzero at 449
while fb ~= 0 && a ~= b

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MathWorks Support Team 2023-4-18

编辑：MathWorks Support Team 2023-4-19

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This is not a bug in MATLAB with the FZERO function, but the expected behavior. Acoording to the documentation, FZERO only accepts handle to a scalar-valued function and finds its root.

One of the ways to find roots of a vector valued function is to pose it as a multi-objective optimization problem. Please refer to the following webpage for more information about minimizing multiple objective functions in MATLAB:

https://www.mathworks.com/discovery/multiobjective-optimization.html