You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: HELP_rand_angle.m
    path of file: ./repos/GIBBON/docs
    
    the code of the file until where you have to start completion: %% rand_angle
% Below is a demonstrat
    
function

%%
clear; close all; clc;

%% Syntax
% |a=rand_angle(siz);|

%% Description 
% This function generates a matrix or array of uniformly distributed random
% angles (of the size siz) in the range [0 2*pi]. The function operates by
% first creating angles in the range 0-pi/2. The angles are next converted
% to unit vectors in the unit circle. The X and Y components of these
% vectors are next independ