search for: quaternions

Hi I have written a whole bunch of methods for objects of class "octonion". [ an octonion is a single column of an eight-row matrix. Octonions have their own multiplication rules and are a generalization of quaternions, which are columns of a four-row matrix. ] So far I've done about a dozen generic functions such as seq.octonion(), rep.octonion(), [<-.octonion(), and so on and so on. Very nearly all of these functions are applicable to objects of class "quaternion". So, for example, I have...

Hi In NEWS, it says R CMD check now tests that the package can be loaded, and that the package and namespace (if there is one) can each be loaded in startup code (before the standard packages are loaded). For package "onion", I think I have followed all of sections 1.6.1 - 1.6.6 of R-exts, and it passes R CMD check for R-2.3.1. However, using R version 2.4.0 Under

On Oct 21, 2007, at 6:23 PM, BGB wrote: > ok, just in my case, I guess I am a little fussy/weird, wanting > efficient dot and cross products (if at all possible, though these > operations at present don't exist natively within SSE...), among > many other operations (length, lerp, renormalization, ..). > > then again, probably a fairly smart compiler could still get

I'm trying to create a package for working on orientation data, i.e. data where the observations are 3D rotations. There are several different representations of orientations in common use: SO(3) matrices, Euler angles, unit quaternions, etc. One thing I'd like is to make it convenient to work in any representation, and have conversions to others done as needed. I'm trying to do all of this in S4 classes. Here's the current class structure I'm using; please let me know if there's something wrong with this:...

...being (namely: 'static', initialized structs, multi-prototypes, C99 style dynamicly-sized arrays, ...). to 'add insult to injury' though, I implemented a few compiler extension features: some partly derived from gcc (__real, __imag, ...); some custom: builtin geometric vectors and quaternions (I do a lot of 3D stuff...); .. I also have Garbage Collection, Dynamic Typing, and Prototype OO available as library features (note, I mean 'Prototype OO', in reference to the object system used in Self, and crudely immitated in JavaScript, and not in reference to "some crude mockup...

Hi All user, I have been using R-2.5.1. dose orientlib support this version? I would like to try. it. I have been wondering how to install the library. With regards, abu _________________________________________________________________ Celeb spotting ? Play CelebMashup and win cool prizes

Hi, Has anyone in R core thought about providing "hyper-dual numbers" in R? Hyper-dual (HD) numbers, invented by Jeffrey Fike at Stanford, are useful for computing exact second-order derivatives (e.g., Hessian). HD numbers are extensions of complex numbers. They are like "quaternions" and have 4 parts to them (one real and 3 non-real). They seem to be available in Julia. Obviously, the HD numbers involve a lot more book keeping. http://adl.stanford.edu/hyperdual/ Thanks, Ravi [[alternative HTML version deleted]]

On Oct 21, 2007, at 5:27 PM, BGB wrote: > well, sadly, I am not sure how people are on this list... I'd suggest browsing through the llvmdev mailing list archive. > now, what I do with it is this: > I use C as a scripting language... > Sounds like a fun project. Note that the clang C front-end also supports use in a JIT environment: this will allow you to JIT the full

In the Green Book, section 7.5 discusses new vector classes and uses quaternions as an example of a vector class that needs more than one number per element. I would like to define a new class that has a numeric vector and a logical vector of the same length that specifies whether the measurement was accurate. The following code does not behave as desired: > setCla...

Can anyone help me install railroad gem? What I need is a simple class diagram of my rails website. Not necessarily with railroad (if you know any other software, for mac, that works). The website is http://railroad.rubyforge.org/ I couldn''t find any explanation on how to install it. Thank you, Rodrigo -- You received this message because you are subscribed to the Google Groups

Hi I thought it would be fun to develop R functionality for the octonions (there is already some work on quaternions). The octonions are an 8 dimensional algebra over the reals, so an octonion may nicely be represented as a real vector of length 8. Applications are many and varied, mostly quantum mechanics. I would like to develop some R functionality in this area. My first problem is how to get (eg) a matri...

What are the current limitations of using -O4 in llvm-gcc-4.2? As a first test, I compiled the molscript program first as -O3 and it works fine. However if i try to compile the same code as -O4, the build fails with... ar -cru clib.a args.o str_utils.o dynstring.o err.o indent.o vector3.o matrix3.o quaternion.o body3d.o extent3d.o io_utils.o colour.o key_value.o named_data.o double_hash.o

https://bugs.freedesktop.org/show_bug.cgi?id=104448 Bug ID: 104448 Summary: [NV106/GK208B] Multiple issues / hangs with nouveau driver Product: xorg Version: unspecified Hardware: x86-64 (AMD64) OS: Linux (All) Status: NEW Severity: major Priority: medium Component:

Dear List I have just uploaded a new package, "onion", to CRAN. It provides some functionality for manipulating and visualizing quaternions and octonions. All comments welcome! enjoy rksh -- Robin Hankin Uncertainty Analyst National Oceanography Centre, Southampton European Way, Southampton SO14 3ZH, UK tel 023-8059-7743 _______________________________________________ R-packages mailing list R-packages at stat.math.ethz.ch h...

...new SSE variants (aka: very new CPUs), operations like dot-product don't exist, and so would have to be simulated (for example, by serializing the values to the stack and running them through the FPU or similar...). so, in general, if one wants specific vectors (such as geometric vectors, quaternions, ...), one usually has to implement them in terms of the existing matrix operations. I don't know what the best way to deal with this in LLVM would be, someone else may have a better idea. as for what targets support which operations, in the case of SSE, go check the Intel and AMD64 docs...

Does anyone have any LLVM IR examples implementing things using the instructions for SSE, like complex arithmetic or 3D vector-matrix stuff? I'd like to have HLVM use them "under the hood" for some things but I cannot see all of the operations that I was expecting (e.g. dot product) and am not sure what works when (e.g. "Not all targets support all types however."). --

Hello, Erwin > The physics engine includes collision detection, rigid body dynamics and > soft body dynamics. This sounds really promising addition to LLVM testsuite! > to compile our source tree and benchmarks. Bullet 2.75 uses a lot of > SIMD-friendly vector operations, Which archs are currently supported for SIMD operations? > The SDK is under Bullet/src and the benchmarks

Using -O4 requires support from the system linker, because the files written out are LLVM bitcode files rather than object files. --Owen On Dec 29, 2007, at 11:43 AM, Jack Howarth wrote: > What are the current limitations of using -O4 in > llvm-gcc-4.2? As a first test, I compiled the molscript > program first as -O3 and it works fine. However if i > try to compile the same code

Hi, We are developing the open source Bullet physics engine, used by game and movie studios, and compiler performance tuning is important to us. See http://bullet.googlecode.com The physics engine includes collision detection, rigid body dynamics and soft body dynamics. I've been following the LLVM project for a while, and it seems the Clang C++ compiler is mature enough to compile our

Hi Anton, Thanks a lot for offering help. Bullet uses basic linear algebra with 4-way vectors, quaternion and matrices. Although most of this is plain portable C++ perhaps LLVM can auto-vectorize some of this? There is a little bit of hand optimized x86 SSE code. This is only enabled on 32bit Windows and Mac OSX Intel builds. >> Should I just use the 2.75 release? If you are interested,