Hello,

I am on Julia 0.3.9, I am trying to implement an American Binomial Spread 
Options model. I got it working, but am wondering if there is a different 
solution, perhaps cleaner one.

I am doing the following to populate the options value's array, and then 
loop over the array to simulate the exercise conditions in the tree:

  
  for i in range(N-1, -1, N)   ## the outer loop is counting down walking 
back in the tree
    for j in range(-i, 2, i+1) 
      for k in range(-i, 2, i+1) 

             C[k+(N+1), j+(N+1)] = "some value" ## so in order to position 
the value to the right location in the Array, I need to adjust the index 
with (N+1)

        end
    end
  end 


The question really is, can I create a matrix and change the indexing like 
A = eye(), so that when A[0, 0] would be the center of the matrix?


Thanks


Sven

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