How can I solve this problem in the matlab program ?

[Vuqar Samedov]

Answer 1

[Daniel Catton]

I believe your maths is incorrect and that is the first problem.

You get your derivitive of u as du = -4x.dx which is correct. Substituting this into the equation would give you:

With this in mind, you also don't need to substitute u into the matlab script as it is only required for computation by hand (for integration by substitution you would normally select u yourself). Thus, you can get the script:

syms x
f = int(x*exp(-x^2))

which outputs the correct answer.

Hope this helps!