fminsearch - passing back variables calculated in anonymous functions

Hi there, I often use anonymous functions in fminsearch. If I'm right, these can only pass back scalar values to fminsearch. But I often would like to have access to variables calculated in the anonymous function from where I called fminsearch. How do I do this? Do I have to declare these variables as global?

Here is a stylised example, where V1 and V2 are calculated in the anonymous function (called minError), and I'd like to use it in the function that included the call to fminsearch (called mainFunction)...

function V=mainFunction

   (...)

   [xOpt, m, ~]=fminsearch(@(x) minError(x), GuessForX);

   V=[V1 V2];

end

function m=minError(x)

V1=x^2;
V2=x;

m=(V1-V2)^2;

end

Thank yoU!