function that does not work

Why does not this function work:

http://bildr.no/view/1000957

this is what i wrote:

function grade=onlyundefined(quiz)

if quiz<0 ||quiz>10
    grade='X'
end

end

Answer 1

[Walter Roberson]

You stored the function in the file "switchletgrade1.m" . The name of the file needs to match the name of the function.

Also, you will need to define the output for the situation when the "if" does not hold true.