Really do not even know where to start

Write a Matlab function that computes the Cartesian position and velocity of a satellite on an orbit in the perifocal frame, given the gravitational parameter µ, the semi-major axis a, the true anomaly, the eccentricity e, and the true anomaly θ.

I haven't taken a MATLAB course and our professor just threw this at us, seriously anything helps. Even just to help me start it out.

[Stephen23]

Do these tutorials (they won't take long, and teach basics that you need to know):

https://www.mathworks.com/help/matlab/getting-started-with-matlab.html

You might also like to try the "MATLAB OnRamp" here:

https://matlabacademy.mathworks.com/

[Jaden Moore]

function [x,y,z] = RVPerifocal( a, e, th )
 
% Compute the position and velocity in the perifical frame, given:
%   a       Semi major axis (km)
%   e       Eccentricity
%   theta   True anaomaly (rad)
%   mu      Gravitational parameter
mu = 398600.44;
 
Re = 6378.14;
 
% perifocal coordinates
r = a*(1-e^2)./(1+e*cos(th));
x = r.*cos(th);
y = r.*sin(th);

This is as far as I can get. IDK where to go from here

[Guillaume]

It's unclear if you need help with the maths (in which case, sorry wrong forum) or with the code, in which case what's the maths your're trying to implement?

[Ajay Pattassery]

What is the relation between the velocity or cartesian position with the mentioned parameters.