5 ms·

Thanks for the feedback, everyone -- happy to answer questions here or in the Disqus comments on my blog.

• tomn 10y ago
  This is really interesting, thanks! If you decide to try to make this faster, check out ceres[0] a non-linear least squares optimisation framework that does automatic differentiation using a clever C++ template hack. I've used it a few times to solve these kind of problems and found it to be very good! [0] http://ceres-solver.org/ http://ceres-solver.org/
  • mzucker 10y ago
    Yep, I'm still waiting to use ceres for something - I didn't end up using it on my image approximation project https://mzucker.github.io/2016/08/01/gabor-2.html https://mzucker.github.io/2016/08/01/gabor-2.html because it doesn't work well with inequality constraints.
    • tomn 10y ago
      Ah yes, only supporting constraints on the parameters can be annoying if your problem requires that.
• owernonvl 10y ago
  I really enjoyed the article! By the way, you mentioned using word boundaries in regexes to replace variable names. GNU Emacs regexes can actually include "symbol boundaries" (which are a little better for variable names than word boundaries), represented as "\_<symbol\_>". Personally, I like using the "highlight-symbol" package, which provides the "highlight-symbol-query-replace" command to basically execute M-% for the symbol at point.
  • mzucker 10y ago
    Cool - will check it out!