Storing output of for loop on a matrix

Question

Catarina 2014-12-4

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/165453-storing-output-of-for-loop-on-a-matrix

评论： Catarina 2014-12-4

Hello! I'm new to Matlab and I'm having difficulties with a for loop. So I have a matrix with 3453 rows which correspond to different observations of interest rates. The columns (30) are their maturities. I have used a for loop to take each of these rows of the matrix and calculate what I need (which involves transforming that interest rate row into a cash flow matrix of 30x30) but the problem is I can't seem to be able to then store the output of all the 3453 observations in a new matrix? It only stores the output of the last observation.

Here is what I have:

s=length(swaps);
m=30;
CFlast = eye(30,30);
for t = 1:s
   cashflows = repmat(swaps(t,:),30,1);      
   CF = cashflows + CFlast;
   for i = 1:30
       for j = 1:30
          if i>j
               CF(i,j) = 0;
          end
       end
   end
     CF = transpose(CF);
     discount = zeros(m,s);
     discount = CF\ones(30,1);   
  end

I've seen previous posters say that in these cases an index should be added - like discount(t) = ... - but when I do that it tells me the matrix dimensions do not match. Can someone please help me? Thank you for taking the time to read and reply!! :)