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would someone be so kind as to explain me the difference between the ordinary givens-rotation and the fast givens-rotation?

I know that the fast givens Rotation reduces the Count of operations to approximately the half. How is this possible?

Thanks in advance for any hints :-)

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    $\begingroup$ Check out section 5.1.13 (Fast Givens transformations) of the book Matrix Computations by Golub and Van Loan (the section number refers to the 2nd edition). $\endgroup$ – GoHokies Sep 7 '15 at 14:28
  • $\begingroup$ Sorry, i dont have any Access to this book. Can you explain the difference in your own words to me? $\endgroup$ – Roland Sep 7 '15 at 14:33
  • $\begingroup$ There is also an explanation in this paper. $\endgroup$ – GoHokies Sep 7 '15 at 14:53

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