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

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MathWorks Support Team on 24 Sep 2013

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https://nl.mathworks.com/matlabcentral/answers/97164-why-do-i-receive-an-error-with-fzero-on-a-vector-valued-function-in-matlab

Edited: MathWorks Support Team on 19 Apr 2023

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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Answer 1

MathWorks Support Team on 18 Apr 2023

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https://nl.mathworks.com/matlabcentral/answers/97164-why-do-i-receive-an-error-with-fzero-on-a-vector-valued-function-in-matlab#answer_106514

Edited: MathWorks Support Team on 19 Apr 2023

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