How are you calling it? What value are you passing in for t? You're not just clicking the green run triangle without giving it a value for t are you? So, let's say t was 10. Are you doing
t = 10;
h = height(t); % Pass in t to the height() function.
fprintf('For t = %.1f, height = %f.\n', t, h);
So, what is your program for calling your height() function? Evidently from the error it thinks you're doing this:
h = height(); % Not passing in anything for t. This will throw an error.
or else you're clicking the green run triangle which will try to run the function without sending in anything for t.
