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: POLAR.m
    path of file: ./repos/Antenna_Theory_Analysis_and_Design_C.A.Balanis---MATLAB/Chapter 02/2-D Polar
    
    the code of the file until where you have to start completion: % ************************************************************************************
% Polar
%**************************************************************************
% This interactive MATLAB program is used to plot two-dimensional (2-D):
%
% A.  Polar (-180 degrees < PATTERN < +180 degrees)
% or
% B.  Semipolar (-90 degrees < PATTERN < +90 degrees)
%
% To accomplish this, PATTERN calls Matlab functions:
%
% C.  Polar_dB.m or Semipolar_dB.m
% D.  f.m
%
% The user MUST specify the function, which represents the LINEAR FIELD pattern 
% of the function whose pattern is to be plotted, in the Matlab function
%
% f.m
%
% The program can plot any of the following:
%
% 1.  Field pattern (linear scale)
% 2.  Power pattern (linear scale)
% 3.  Power pattern (in dB)
%
% Program was written by:
% Bo Yang, AHE Lab 
% Department of Electrical Engineering
% Arizona State University
% February 2004


function Patt2D

clear all;
close all;

% Data Entry
fprintf('\n-------------------------------------------------------');
fprintf('\nThis program calls function Polar_dB.m or Semipolar_dB.m');
fprintf('\nto plot 2D Pattern in Polar Coordinates');
fprintf('\n-------------------------------------------------------\n');
fprintf('\n   *** NOTICE: Please edit m-file "f.m" to input field pattern expressions!\n\n');
fprintf('   Make sure to use dot operations(".*","./" and ".^") in the expression,\n')
    
function whose pattern is to be plotted, in the Matlab function
%
% f.m
%
% The program can plot any of the following:
%
% 1.  Field pattern (linear scale)
% 2.  Power pattern (linear scale)
% 3.  Power pattern (in dB)
%
% Program was written by:
% Bo Yang, AHE Lab 
% Department of Electrical Engineering
% Arizona State University
% February 2004


function Patt2D

clear all;
close all;

% Data Entry
fprintf('\n-------------------------------------------------------');
fprintf('\nThis program calls function Polar_dB.m or Semipolar_dB.m');
fprintf('\nto plot 2D Pattern in Polar Coordinates');
fprintf('\n-------------------------------------------------------\n');
fprintf('\n   *** NOTICE: Please edit m-file "f.m" to input field pattern expressions!\n\n');
fprintf('   Make sure to use dot operations(".*","./" and ".^") in the expression,\n');
fprintf('   instead of regular operations("*","/" and "^")!\n\n\n');;

% Plot Range
ERR = 1;
while(ERR ~= 0)
   fprintf('\nPlease specify the range of theta in the form "[theta1,theta2]"\n');
   fprintf('(-180 <= theta1 <= theta2 <= 180 (degrees), for example: [-180,180])\n');
   fprintf('-----------------------------------------------------------------\n');
   thrg = str2num(input('Input: ','s'));
   s=size(thrg);
   if (s(1) ~= 1) | (s(2) ~= 2)
      fprintf('\n   *** ERROR: Please specify the range in the form "[theta1,theta2]")!\n\n','r');
   elseif (thrg(1) < -180) | (thrg(1) >= thrg(2)) | (thrg(2) > 180)
      fprintf('\n   *** ERROR: Theta must satisfys: -180 <= theta1 <= theta2 <= 180 (degrees)")!\n\n');
   else
      ERR = 0;
   end