Problem 963. We love vectorized solutions. Problem 1 : remove the row average.

Solution 144335

Submitted on 4 Oct 2012 by Wolfgang Schwanghart

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Test	Status	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 = 0.0171
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 = 0.3789

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