Cody

Problem 930. 1D DCT-II transform.

Solution 201722

Submitted on 7 Feb 2013 by Claudio Gelmi
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Test Suite

Test Status Code Input and Output
1   Pass
%% test 1 x = eye(4); y = mydct(mydct(x)); y_corr = eye(4); assert( norm( y_corr(:) - y(:)) < 1e-10 );

a = 0.5000 0.5000 0.5000 0.5000 0.6533 0.2706 -0.2706 -0.6533 0.5000 -0.5000 -0.5000 0.5000 0.2706 -0.6533 0.6533 -0.2706 a = 1.0000 0 -0.0000 -0.0000 0.0000 1.0000 0.0000 0.0000 -0.0000 0.0000 1.0000 0.0000 -0.0000 0.0000 0.0000 1.0000

2   Pass
%% test 2 x = 10; y = mydct(mydct(x)); y_corr = 10; assert( norm( y_corr(:) - y(:)) < 1e-10 );

a = 10 a = 10

3   Pass
%% test 3 x = [1 0]; y = mydct(x); y_corr = sqrt(2)/2*[1;1]; assert( norm( y_corr(:) - y(:)) < 1e-10 );

a = 0.7071 0.7071

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