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Loren on the Art of MATLAB

Archive for October, 2007

About

Loren Shure works on design of the MATLAB language at The MathWorks. She writes here about once a week on MATLAB programming and related topics.

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  • J.B. Brown: Ah, and I am at fault for simply testing collinearity with the origin in the example above.
  • J.B. Brown: Indeed, > collinear( [0 3],[0 8],[0 -1e21+2e-15] ) ans = 1 > collinear( [0 3],[0 8],[0 -1e22+2e-15]...
  • OkinawaDolphin: Loren, thank you for telling me where to download timeit. Here are the two functions I just tested...
  • Loren: JB- It looks to me like Ilya’s solution and therefore yours are equivalent to the determinant. As Tim...
  • Loren: OkinawaDolphin, timeit can be downloaded from the File Exchange. Steve Eddins is the author. It does not ship...
  • OkinawaDolphin: It seems that neither R2007a nor R2007b have the function timeit, but I investigated computation time...
  • J.B. Brown: It would appear to me that Ilya Rozenfeld’s solution would be the cleanest. Just to help those who...
  • Loren: Markus- Congratulations on winning! And a nice illustration of how the size matters. Small enough, and the...
  • Markus: Hi Loren, which version is fastest also depends very much on the matrix dimensions. Look at my test function:...
  • Duncan: OkinawaDolphin, Regarding why your third example is slower than your second example, the result is in fact...

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