translate equation to matlab code

hellow I would like to translate this equation to matlab code, I am new to matlab language and syntax and would very much appreciate help.

[David Goodmanson]

Hi Or,

If you are doing this numerically, as you probably already know, N = [1 2 3] creates a row vector, N = [1; 2; 3] creates a column vector.

Dot and cross functions are available in Matlab, see 'doc dot' and 'doc cross'. The cross function outputs a column vector if both inputs are column vectors, and a row vector otherwise.

Answer 1

[Jon Wieser]

s2_hat= n1/n2*(N_hat*(-N_hat*s1_hat))-N_hat*sqrt(1-(n1/n2)^2*(N_hat*s1_hat)*(N_hat*s1_hat))

Answer 2

[Giuseppe]

e^(-x^2)*sin(x)