A nested function cannot be defined inside a control statement (if, while, for, switch or try/catch).

Be aware that in addition to this message, other messages might appear in the file. Such as, <control statement> might not be aligned with its matching END and Parse error at END: usage might be invalid MATLAB syntax. When you remove the nested function definition from the control statement, these other messages might disappear.

Rewrite the code so that a function is not defined within a control statement. For example, rewrite code such as this:

function foo(n)
while n > 10
    function fs
    disp('n is greater than 10')
    end
    n = n-1;
end
end

like this:

function foo(n)
while n > 10
    fs
    n = n-1;
end
    function fs
        disp('n is greater than 10')
    end
end

For more information, see Nested Functions.