x1 1 1 0 0(adsbygoogle = window.adsbygoogle || []).push({});

x2 0 0 1 1

x3 = 1 + -1 + 0 + 0 Each of these numbers in vertical form are meant to be

x4 0 0 1 -1 vectors

Where do these coefficients come from 0.5(x1+x3) 0.5(x1-x3) 0.5(x2+x4) 0.5(x2=x4)

The first coefficient goes in front of vector one and so on..

Thanks

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# Understanding this step

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