Unformatted text preview: sults are shown in ±igure 4.1. The program posted has been modiFed in postedfac to use vector operations, use internal functions like norm when possible, and pre-allocate storage for Q and R . The postedfact function runs 150-200 times faster than posted on matrices with 200 rows, using a Sun UltraSPARC-III with clock speed 750 MHz running MATLAB 6. It is an interesting exercise to determine the relative importance of the three changes. You also might think about how an eﬃcient implementation in your favorite programming language might di²er from this one....
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- Fall '11
- Computer Programming, Computer program, C. Nonzero columns