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Correct

12Size
This is the leading solution.
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Test Suite

Test
Code Input and Output
1
Pass
 
x = [ 0 1 ; 2 3 ] ;
y_correct = [ -0.5 0.5 ; -0.5 0.5 ] ;
y = remove_average_vectorized(x);
assert(isequal(y,y_correct));

                    
2
Pass
 
%%
x = [ 0 1 ; 2 3 ] ;
timer=tic;
y = remove_average_vectorized(x);
duration=toc(timer)
% You can probably pass this test with a for loop.
assert(duration<0.1,sprintf('Time used %2.3f\n',duration));
duration =
   5.8700e-04
3
Pass
 
%%
x = [ 1:9999 ; 2:10000 ; [ zeros(1,9998) 9999 ]  ];
x = repmat(x,1000,1);
y_correct = [ -4999:1:4999 ; -4999:1:4999 ; [ repmat(-1,1,9998) 9998 ] ];
y_correct = repmat(y_correct,1000,1);
y = remove_average_vectorized(x);
assert(isequal(y,y_correct));

                    
4
Pass
 
%%
x = [ 1:9999 ; 2:10000 ; [ zeros(1,9998) 9999 ]  ];
x = repmat(x,1000,1);
timer=tic;
y = remove_average_vectorized(x);
duration=toc(timer)
% A decent vectorized solution should take around 1 second.
assert(duration<2,sprintf('Time used %2.3f\n',duration));
duration =
    1.8639