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  1. # your code goes here
  2. A = randi( 500, 1, 100000 );
  3. B = randi( 500, 1, 100000 );
  4.  
  5. tic;
  6. ub = unique( B );
  7. toc
  8. tic;
  9. C = zeros(1, numel(ub));
  10.  
  11. for ii = 1:numel(ub)
  12.    C(ii) = sum(A(B==ub(ii)));
  13. end
  14. toc
  15.  
  16. tic;
  17. [ignore idx] = histc( B, [ub-.5 ub(end)+.5] );
  18. C2 = accumarray( idx', A' )';
  19. toc
  20. assert( all( C-C2 == 0 ), 'non matching results' );
  21. disp('==============================================')
Success #stdin #stdout 0.58s 65304KB
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Standard input is empty
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Elapsed time is 0.0207201 seconds.
Elapsed time is 0.336658 seconds.
Elapsed time is 0.025557 seconds.
ans =

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 Columns 101 through 120:

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 Columns 481 through 500:

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==============================================
https://ideone.com/VCbNI0
language:
Octave (octave 4.4.1)
created:
9 years ago
visibility:
public

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