Syntax problem with a user-defined function with sine

Hello, I need to make this function r(𝜃) = 𝜋(3―sin^5*𝜃) as a user-defined function, but I keep getting the "Error using sin - Not enough input arguments." This is how I defined the function so far:

r(theta)=my_function(pi(3-sin.^5*theta));

How do I fix it?

Answer 1

[KSSV]

function r = my_function(thet)
    r = pi*(3-sin(theta)^5) ; 
end

Save the above, it will be saved on he name my_function.m. Or copy it under your main function code.

You can also define anonymous function as shown below:

r = @(theta) pi*(3-sin(theta)^5) ;
r(pi/2)

Note: your theta shoould be in radians. If you want theta in degrees either convert it to radians or use sind