matlab hampeh

%%%%%In this file, it will extract values of from the original file
which
%%%%%is acs107_coursework2. From these values it will then input  new
%%%%%fields into the output. It will also find the best straight line
and
%%%%%the best quadratic from the selected value of x and y (selected
from
%%%%%choice_of_4) and plot it in figure 1.

function task1 = coa04kik_cw2_task1(input)

%%%Extract the variables
task_1=input{1};
set_of_data=task_1(1).choice_of_4;
task1=task_1(set_of_data);

figure(1);clf reset;
for numb=1:4;
   xvalues=task1(numb).xvalues;
   yvalues=task1(numb).yvalues;
  
   %%%%insert the additional fields
   task1(numb).linecoef=polyfit(xvalues,yvalues,1);
   task1(numb).quadcoef=polyfit(xvalues,yvalues,2);
   task1(numb).yline=polyval(task1(numb).linecoef,xvalues);
   task1(numb).yquad=polyval(task1(numb).quadcoef,xvalues);
      
   %%%%Plotting the graphs.   
   subplot(2,2,numb);
  
plot(xvalues,yvalues,'b',xvalues,task1(numb).yline,'y',xvalues,task1(numb).yquad,'r');
   legend('Original graph','Best line','Best quadratic');
   function_name=task1(numb).functionname;
   title(function_name);
   xlabel('value of x');
   ylabel('value of y');

end