MATLAB: “Struct contents reference from a non-struct array object” error in fzero

function handlefzeroMATLABstruct contents

A bit of background: I have a few versions of Matlab on my computer (2012a and 2014a). I recently started having problems with commands that used to work, an example being fzero. When I run it, I get the error "Struct contents reference from a non-struct array object." Strangely, this happens both on my primary version (2014a) and backup version (2012a). I also installed 2016a to test it and it's also giving the same error.
>> X = fzero(@(x) sin(3*x),2)
Struct contents reference from a non-struct array object.
Error in fzero (line 167)
    error(message(errStruct.identifier));
Does anyone have any idea what's going on or how to fix this?

Best Answer

Make sure you're calling the version of the fzero function included in the release of MATLAB that you're using.
which -all fzero
Also make sure you haven't overloaded the fcnchk function.
which -all fcnchk
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