Cody

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

Solution 182974

Submitted on 29 Dec 2012
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Test Suite

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 = 1.2600e-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   Fail
%% 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));

Error: Time used 4.740

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