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nhigham.com | ||
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buttondown.com
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| | | | | I saw a fun post this week about interpreting colours as vectors and the way you can exploit that interpretation to nicely represent certain operations you... | |
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nickhar.wordpress.com
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| | | | | 1. Low-rank approximation of matrices Let $latex {A}&fg=000000$ be an arbitrary $latex {n \times m}&fg=000000$ matrix. We assume $latex {n \leq m}&fg=000000$. We consider the problem of approximating $latex {A}&fg=000000$ by a low-rank matrix. For example, we could seek to find a rank $latex {s}&fg=000000$ matrix $latex {B}&fg=000000$ minimizing $latex { \lVert A - B... | |
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xcorr.net
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| | | | | Matlab supports 3 forms of indexing matrices. There is the familiar range indexing that selects a submatrix within a larger matrix: This is also called sub-indexing. There is also logical indexing: These two methods are fairly expressive, yet there are a certain number of operations which are awkward or impossible to perform with these. Let's... | |
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xcorr.net
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| | | I've updated my automatic 2d Gaussian surface fitting function, available in Matlab Central, to add a function to fit Gabors to noisy data. As I've discussed previously, fitting a parametric surface to noisy data is pretty trivial whether it's a Gabor, Gaussian, or otherwise -- it's a straightforward application of numerical optimization that can be... | ||
