how to store data in a matrix

Hello everyone,

I have problem about how to store data in a matrix. Here is my code,aparently, theres problems.

a=5;
m=0;
M=[];
for i=1:72;
    c1(i)=i;
    c2(i)= c1(i)+1;
  for j=2:5;
      p1(i)=c1(i)+j;
      if j==2
         n=3:6; p2(i)=p1(i)+n;  
      elseif j==3
             n=4:6; p2(i)=p1(i)+n;  
      elseif j==4
             n=5:6; p2(i)=p1(i)+n;  
      elseif j==5
             n=6; p2(i)=p1(i)+n;  
      end    
      if p2(i)<= 72
          m=m+1;
          M(m,:)=([m,c1(i),p1(i),p2(i),c2(i)]);
      end
  end
end

what i want to do here is:

c1=i,c2=c1+i,
if p1=c1+2, then p2=p1+3,p2=p1+4,p2=p1+5,p2=p1+6
if p1=c1+3, then p2=p1+4,p2=p1+5,p2=p1+6
if p1=c1+4, then p2=p1+5,p2=p1+6
if p1=c1+5, then p2=p1+6

and finally save data as [c1,c2,p1,p2] for each measurements

here is where i have problem:

if j==2
    n=3:6; 
    p2(i)=p1(i)+n;

I dont know how could i achieve this, anyboday would like to give a hand? Thanks in advance

[Oleg Komarov]

For next time review how to markup your question to make it more readable:

http://www.mathworks.com/matlabcentral/answers/13205-tutorial-how-to-format-your-question-with-markup

[Lei]

thx Oieg

Answer 1

[John Petersen]

Try this:

m=1;
for i=1:72;
  for j=2:5;
     p1 = i+j;
     n=[j+1:6];
     p2 = i + n;
     for k=1:length(n);
       M(m,:)=([m,i,i+1,p1,p2(k)]);
       m=m+1;
    end
  end
end

[Lei]

Hello, John, your code is very helpful!!! one last step to my dream code. I need to make sure I constrain that c1,c2,p1,p2 <=72. I went out this afternoon and just got back. So i will take a look at tomorrow and revise a little bit to achieve my final goal. Thanks for your guys help! i have learned a lot here!

[John Petersen]

I'm assuming you just want to rid yourself of the rows with p2>72. You could do it by adding this to the end of the code.

ind = find(M(:,5)<=72);
M = M(ind,:);

or by inserting a test on p2 before the for k loop.