can someone help me ? , something error in my code

Answer 1

[Torsten]

f = 200*x./(x+5).*exp(-2*x/30)

[ZEYAD SAAD]

thank you

Answer 2

[John D'Errico]

Please don't post a picture of your error. Text works just fine, and then we can copy your code and paste it into MATLAB.

Anyway, it works just fine for me. What is the problem? Maybe you need to learn what the .* and ./ and .^ operators do? They are there to do element-wise operations.

a = 0;
b = 30;
x = a:5:b;
f = 200*x./(x+5).*exp(-2*x/30)
f =
            0       71.653       68.456       55.182       42.176       31.479         23.2

That tends to suggest you need to read the getting started tutorials for MATLAB, where you would learn exactly these things. In the end, it will be time well spent.

[ZEYAD SAAD]

thank you