Two functions that demonstrate computation of dual-function whitening filters termed Linear Extended Whitening Filters (EWF) such that:
1. EWF W whitens a random-vector X, and triangularizes a matrix H when applied as WH.
2. EWF W whitens a random-vector X, and decorrelates a second random-vector Y.
Based upon: Linear Extended Whitening Filters, arXiv:1310.3454.
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