matrix for loop question

Suppose I have a matrix [1 2 3 5;1 3 4 5]. Each row represents a path and each column represents the nodes of that path. For example: for row 1 : 1-2-3-5 is a path with nodes 1, 2 ,3, 5(where one is the start node and 5 is the end node). I want to consider an arc and arcs following that arc. For example: I want to consider (1,2) and (2-3) and assign a cost to it. I wrote a code but its showing an error. please help!

    for kkp = 1:size(R{ip},1) % R{ip} is my path matrix
      for jjp = 1:size(R{ip},2)-1
          for iip = 1:size (R{ip,2} -2)
              up = R{ip}(kkp,jjp);
              vp = R{ip}(kkp,jjp+1);
              wp =  R{ip}(kkp,jjp+2);
              cost1 = wt(up,vp); %wt(i,j) is a cost matrix that i already inputed.
              cost 2 = wt(vp,wp);
          end
      end
  end

Answer 1

[Eugene]

You're indexing 'R' as a 1-D cell array at the start however in the third line you start indexing the 2nd dimension.

 for iip = 1:size (R{ip,2} -2)

I think you meant

 for iip = 1:size(R{ip},2) - 2

And a typo at (no space between 'cost' and '2'):

 cost 2 = wt(vp,wp);

[jana]

I've made the correction but it is still showing an error. My cost2 outpput is coming as zero but that is not right.

my wt matrix is :

wt =[0 2 4 0;1 0 5 3;4 5 0 5;0 3 5 0];

so if for path 1-2-3-4 cost1 should be 2 and cost2 should be 5 (for 2-3) and 5 (for 3-4) .

[jana]

nevermind..I fixed it. Thanks.