MATLAB: Can anyone explain me this code?

x5;
x8=load('hearttest.txt');
c4=size(x8)*[1;0];%calculating size of matrix.
u1=size(x8)*[0;1];
x6=x8;
%==========================================================

per=80;
per1=20;
al=0.1;
pe=per/100;
v=round(pe*c3);
%==========================================================
% 
%==================================================================










%separating the input attributes and the target from the input file
%==================================================================
%Reading input in an array
for s1=1:m
  for i=1:c3
      if(x5(i,u)==(s1-1))
          for(j=1:u)
              temp=x5(s1,j);
              x5(s1,j)=x5(i,j);
              x5(i,j)=temp;
          end
      end    
  end
end
%==================================================================
%==================================================================
%TARGET CLASS vectors
%
for i=1:c3
  for j=1:u
      if((j==u))
          t(i)=x5(i,j);
      end
  end
end
%==================================================================
for i=1:c3
  for j=1:u-1
      x(i,j)=x5(i,j);
  end
end
%==================================================================
%INPUT vectors
for i=1:c3
  for j=1:u-1
      if x(i,j)==0
          x(i,j)=.05;
      end
  end
end
%==================================================================
%==================================================================
%Normalizing the datas.
q2=size(x)*[0;1];
p2=size(x)*[1;0];
y=max(x,[],1);
z=min(x,[],1);
for i=1:q2
  if y(i)~=z(i)
      e(i)=y(i)-z(i);
  else
      e(i)=1;
      z(i)=0;
  end
end
for i=1:p2
  for j=1:q2            
      x(i,j)=(x5(i,j)- z(j))/(e(j));
  end
end
x8;
q5=size(x8)*[0;1];
p5=size(x8)*[1;0];
y=max(x8,[],1);
z=min(x8,[],1);
for i=1:q5
  if y(i)~=z(i)
      e(i)=y(i)-z(i);
  else
      e(i)=1;
      z(i)=0;
  end
end
for i=1:p5
  for j=1:q5            
      x8(i,j)=(x8(i,j)- z(j))/(e(j));
  end
end
x8;
%==================================================================
%==================================================================
%STEP1:
%Initialising then weight matrix.
%==================================================================
for i=1:u-1
  for j=1:4
      w(i,j)=x(j,i);
  end
end

Best Answer

I've got a better idea:
1. What is size(x8)?
2. Why don't you tell us what you think the names of the different parameters and variables represent.
3. Add as many comments as you can regarding what you think each part of the code is doing
4. Add questions where you are not sure what the code is doing.
Greg
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