MATLAB: Matlab function undefined variable error

Question

Hi i have used matlab function in simulation and the function equation is

function y = ks(u)

y = u*lo;

end

I have difined lo in m.file at the same name of the function "ks"

lo=5;

evry time i eun the simulation i got error "Undefined function or variable 'lo'."

Answer 1

Define lo inside the function

function y = ks(u)
    lo = 5;
    y = u*lo;
end