MATLAB: Fast FIFO Array/Other Datatype

datatype suggestionfifo

I'm trying to plot something in real time using an FIFO array. I'm implementing the array using the advice someone else here gave me (thank you!) of the following sort:

array = {1,2,3,4};
array = array(2:end)
array{end+1} = 5

Unfortunately this is a bit too slow for what I'm trying to do :(. Could anyone suggest either an efficient FIFO array-like data structure? Or just a faster way?

Best Answer

array(1:end-1) = array(2:end);
array{end} = newvalue;

This avoids having to grow the array.

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MATLAB: Code optimization for nested for loop

Instead of implementing the nested loop by hard coding, you can use a vector as iteration counter:

function Result = Method1
nIter  = 490314;;
i0     = 0;
n      = 16;
Result = zeros(n, nIter);
b      = [zeros(n-1, 1); 1];
step   = 1/8;
for k = 1:nIter
   Result(:, k) = b;
   
   % Increase index vector b:
   b(n) = 0;
   for ib = n-1:-1:1
      if sum(b) <= 1 - step
          b(ib) = b(ib) + step;
          break;   % Update of b has finished
      end
      b(ib) = i0;  % reset current b
   end
   b(n) = 1 - sum(b(1:15));
end
Result = Result.';

Please test and adjust this to your needs. This is about 50% slower than the code in my other answer Method2, but nicer.

Accesing the Result columnwise instead of rowwise allows a better usage of the processor cache.

By the way: This code obtains all row vectors with 16 elements, which contains elements of teh set 0:1/8:1, which have the sum of 1.0.

MATLAB: In this file how can I calculate a(1)+a(2)+a(3)

sum(a)

Best Answer

Related Solutions

MATLAB: Code optimization for nested for loop

MATLAB: In this file how can I calculate a(1)+a(2)+a(3)

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