search for: algorithim

Dear R community In a current paper, I'm (briefly) considering the topic of producing scatterplots or maps with point labels positioned in such a way as to minimize label overlap and occlusion. This is a topic with a large, but scattered literature. In CS, it is considered NP-hard, but there are a variety of approximate solutions. The most complete bibliography I've found is the

I'm looking for an R equivalent of Beaton's (1964) Sweep algorithim for partial inversion of a matrix by pivoting. It implemented in SAS/IML as sweep(matrix, indices), described here http://support.sas.com/documentation/cdl/en/imlug/59656/HTML/default/langref_sect266.htm and here for python http://adorio-research.org/wordpress/?p=262 -- Michael Friendly Em...

Hi, I am using wxRuby 1.9.7 and Ruby 1.8.6. I have built an extension in C++ and used swig to load it into Ruby interpreter, which works great. The extension is an often long executing algorithm, and I''ve noticed that if I fork a new Ruby thread in button clicked event, and in this thread run the algorithm the application freezes for the time of execution. I have looked through the

Hiya, Here is the sources to my "rehuff" program. ./rehuff in.ogg out.ogg does a lossless recoding of a vorbis stream. (It generates optimal huffman codes for the particular stream). This code is meant for developers only, until someone is kind enough to provide good build and configure support for it. I won't. And no installation help questions please. There is a little patch

Hello there! I'm starting with ggplot and was wondering how I could control the axis of a plot. I would like the axis of the plot to be drawn black which I thought to acheive with the option axis.colour="black". However, this had no real effect on the plot. Then I found grid.colour which I changed to black as well. Now I got my axis as I wanted them, but ggplot now draws the grid

In http://www.aidanf.net/rails_user_authentication_tutorial there is a string called require ''digest/sha1'' in the model. What does it do? Everything else is well explained besides that. -- Posted via http://www.ruby-forum.com/.

Please can someone look at my last two posts and try and shed some light onto why my system is dropping calls.. If I don't get it right we will be forced to drop Asterisk which I really don't want to do.. Thanks..

Drag and drop sorting is great but if you had a list of, say, 100 items, you''d probably want to show only 10 per page. Has anyone seen any way to use the a drag and drop style sorting method over a number of pages? I see it working by having the displayed list sortable as normal then an item is moved to the next page by dragging it onto the ''next'' link... maybe...

...ho is that only the near end hears it. The far end is not in the echo loop. In almost all cases, the end user is not given any provision for properly balancing the hybrid and is stuck with mathematically removing the resulting echo after the fact. 2) Almost all (if not all) echo cancelling algorithims operate by generating multiple copies of the received signal, each delayed by some small time increment In digital terms, this is the equivalent of a shift register and each delayed signal appears at its own unique "tap". The number of taps determines the size of the echo delay tha...