signal statues Name function

I have trouble delaing with one of my homework questions, and here is the question:

When the function is called, myParamwill contain a single character. When properly called, the function must return a character array with a message based on the instructions that follow.

If myParamcontains gthen it must return a character array containin green.

If myParamcontains ythen it must return a character array containin yellow.

For all other cases, it must return a character array containin red.

I wrote my code as this:

res = getSignalStatusName(myParam)

myParam = 'k';

if myParam == 'g'

res = 'green';

elseif myParam == 'y'

res = 'yellow';

elseif myParam == 'r'

res = 'red';

end

end

But when I ran the code, it showed that

Undefined function or variable 'res'.

Does anyone can help me about this issue? Thanks.

Answer 1

[Stephan]

Hi,

you fogot to specify that it is a function. This is why the error occurs:

function  res = getSignalStatusName(myParam)
    if myParam == 'g'
        res = 'green';
    elseif myParam == 'y'
        res  = 'yellow';
    elseif myParam == 'r'
        res  = 'red';
    end
end

I recommend to check this code again and test it against the conditions of your description. Does it really do what is wanted? I leave it to you to find this out, since it is a homework.

Best regards

Stephan