search for: fourmilab

Dear list, I'd like to ask for some advice in creating a wrapper function for this C code, http://www.fourmilab.ch/documents/specrend/ http://www.fourmilab.ch/documents/specrend/specrend.c I could probably port it in R, but I've been hoping to use compiled code for a while and this looks like a good test case. Unfortunately, the only success I've had so far is with the too simple factorial(int...

Hi there, I try to plot visible light spectrum (380nm~780nm) with color corresponding to the specific wavelength. However, I don't find a function that could do this. Another question, it's possible to plot a color space chromaticity diagram like this: http://upload.wikimedia.org/wikipedia/commons/thumb/0/02/CIExy1931.svg/300px-CIExy1931.svg.png Thanks in advance! Jinsong

I am not sure if I should ask this question in this list. But I'll try. Currently I am trying to analyze images using EBImage and biOps. One of the features that I need to extract from various images is the color spectrum, namely, which colors each image consists of. So, each image hopefully can be converted into some sort of color histogram so that color ingredients are easily comparable

...nd card: pcm0: <Intel ICH3 (82801CA)> port 0xe100-0xe13f,0xe000-0xe0ff irq 11 at device 31.5 on pci0 pcm0: [GIANT-LOCKED] pcm0: <Cirrus Logic CS4299 AC97 Codec> It produce very good entropy. I tried those tests to prove its quality: - FIPS 140-2 tests - 'ent' tests: http://www.fourmilab.ch/random/ - Famous 'diehard' tests The full output from diehard tests is here: http://people.freebsd.org/~pjd/misc/sndrand_diehard.txt The idea of using sound card as entropy source was taken from RFC 1750. If people like the idea and someone more skilled than me in this subject can r...

Proposed changes to omindex Currently Available Items ========================= 1) Have the Q prefix contain the 16 byte MD5 of the full file name used for document lookup during indexing. 2) Add the document?s last modified time to the value table (ID 0). This would allow incremental indexing based on the timestamp and also sorting by date in omega (SORT=0) a. Currently I store the timestamp