Hi Payjay,
According to the MATLAB R2024a documentation, you cannot define a nested function inside any of the control statements, such as if, elseif, else, switch, case, for, while, or try/catch.
What you can do is define the nested function outside the if control statement and then call the function inside this control statement. For example:
function x = first
% Your code logic
function y = nested
% Your code logic
end
end
if true
result = first
end
For more information on the usage of nested function, you can refer to the following documentation: Nested Functions