search for: symmetry

...ogram on S-plus, and it worked. Also I tried the same program on R but not worked. Here is the programme. I put it in a function form. The model and assumption are at the bottom. where counts<-c(22,2,2,0,5,7,14,0,0,2,36,0,0,1,17,10) which is name.data, i is row size and j is the column size. symmetry function(i, j, name.data) { row <- (c(1:i)) col <- (c(1:j)) name.data <- expand.grid(A = row, B = col) name.data$counts <- c(counts) name.data$symm <- paste(pmin(as.numeric(name.data$A), as.numeric(name.data$B)), pmax(as.numeric(name.data$A), as.numeric(name.data$B)),...

Dear R users, I have a question about the patterned variance-covariance structure for the random effects in linear mixed effect model. I am reading section 4.2.2 of "Mixed-Effects Models in S and S-Plus" by Jose Pinheiro and Douglas Bates. There is an example of defining a compound symmetry variance-covariance structure for the random effects in a split-plot experiment on varieties of oats. I ran the codes from the book and extracted the variance and correlation components: >library(nlme) >data(Oats) >fm4OatsB <- lme(yield~nitro, data=Oats, random=list(Block=pdCompSymm(~Va...

Does anyone know if any R package has a function that will conduct Hollander's test of bivariate symmetry? (Hollander, Biometrika, 1971) Either the exact test or an asymptotic version would be sufficient for my purposes. Thanks. Joe Boyer Statistical Sciences Renaissance Bldg 510, 3233-D Mail Stop RN0320 8-275-3661 cell: (610) 209-8531 [[alternative HTML version deleted]]

Open Letter to Developers, Is there any way you can cut through the mob scene at Homeland Defense with a powerful new encryption/decryption formula? The government cryptography bunch are stuck in symmetry and asymmetry and are deaf/dumb/blind to supersymmetry. When it's so easy to line up a supersymmetrical hypercube fractal-to-fractal, pair-to-pair, quantum-to-quantum and slice through all the mathematical protocols using set-to-set precision, it's clear that perfect internet or banking...

Dear R users, I am not good in R-language programming. So, i need your help. I want to convert my lower-triangle value of symmetry matrix into a vector with their row and column name. I found a function called "sm2vec" in "corpcor" package but it give only a vector of values but not row and column names. But i also want ROW and COLUMN name together with their corresponding values. To make more clear,  For...

Hi All, I'm trying to implement a quasi symmetry model for data on twin pairs. A crosstabulation of twin 1 by twin 2 (assumed symmetrical) stratified by another variable. There is a good paper on this by Phil (?) McCloud and Darroch in Biometrika (1995) which explains the method, but I've not done this before so am not clear how to code...

Hello list, Sorry, these questions are not directly linked to R. If I consider an indefinte real matrix, I would like to know if the symmetry of the matrix is sufficient to say that their eigenvectors are real ? And what is the conditions to ensure that eigenvectors are real in the case of an asymmetric matrix (if some conditions exist)? Thanks in Advance, St?phane DRAY ------------------------------------------------------------------...

...gt; Yep, that looks wrong (probably want to continue discussion over on R-devel) >> I think the culprit is here (in src/nmath/choose.c) >> if (k < k_small_max) { >> int j; >> if(n-k < k && n >= 0 && R_IS_INT(n)) k = n-k; /* <- Symmetry */ >> if (k < 0) return 0.; >> if (k == 0) return 1.; >> /* else: k >= 1 */ >> if n is a near-integer, then k can become non-integer and negative. In your case, >> n == 4 - 1e-7 >> k == 4 >> n - k == -1e-7 < 4 >> n &g...

Hello-- In the interest of Symmetry, does anyone else in the world see any need for a device like the IAXy (or the SIP ones from other manufacturers, like the ATA186), but one that presents an FXO interface instead, so it can be connected not to phones, but the PSTN? murf

...bly want to continue discussion over on R-devel) >>>> I think the culprit is here (in src/nmath/choose.c) >>>> if (k < k_small_max) { >>>> int j; >>>> if(n-k < k && n >= 0 && R_IS_INT(n)) k = n-k; /* <- Symmetry */ >>>> if (k < 0) return 0.; >>>> if (k == 0) return 1.; >>>> /* else: k >= 1 */ >>>> if n is a near-integer, then k can become non-integer and negative. In your case, >>>> n == 4 - 1e-7 >>>> k =...

Andreas Neustifter wrote: > Well it does look not too good the text is getting to small in this > case, what do you think of this 128x128 version? Hmm, that one has its left wing cut off, that wreaks havoc on the symmetry. The 136x136 version at http://llvm.org/Logo.html seems perfect for websites, though. It only lacks the text. What font did you use? Albert -- Dr. Albert Gr"af Dept. of Music-Informatics, University of Mainz, Germany Email: Dr.Graef at t-online.de, ag at muwiinfa.geschichte.uni-mainz.de W...

...g against that, > I think removing it would be better, as in many cases (e.g. VBR), the > call just doesn't make sense). This would of course break the API (not > the ABI), but given the fact that it was never implemented, any app that > uses it is already broken anyway. I like the symmetry of having both GET and SET. If you ask a library to set an internal value, it's nice to be able to retrieve that from the library later, and know that you're getting the actual current value. It's also nice to be able to GET the current value, before you've set anything -- eg. to r...

Hi, I have two products which are substitudes. I try to fix a system as below to mydata. Demand1 = A1 -B1*Price1 + C1*Price2 Demand2 = A2 +B2*Price1 - C2*Price2 I would expect C1 & B2 to be symmetric, If they are truly substitude. How can I enforce this symmetry when creating a system of equations via SystemFit ? -- View this message in context: http://www.nabble.com/SystemFit-tp24588252p24588252.html Sent from the R help mailing list archive at Nabble.com.

...irkin wrote: > READ_ONCE is really all over the place (some code literally replaced all > memory accesses with READ/WRITE ONCE). Yeah, so? Complain to the compiler people for forcing us into that. > Would an API like WRITE_POINTER()/smp_store_pointer make sense, > and READ_POINTER for symmetry? No, the whole point of the exercise was to get away from the fact that dependent loads are special.

...irkin wrote: > READ_ONCE is really all over the place (some code literally replaced all > memory accesses with READ/WRITE ONCE). Yeah, so? Complain to the compiler people for forcing us into that. > Would an API like WRITE_POINTER()/smp_store_pointer make sense, > and READ_POINTER for symmetry? No, the whole point of the exercise was to get away from the fact that dependent loads are special.

...at least as > accurate as pow2(sqrt(x)), so it's only unsafe in so far as one's code > is actually depending on an imprecise result. Giving more-than-expected precision can be just as bad for the user as less. It tends to come up in situations where the optimization would break some symmetry, the same way that aggressively forming FMAs can break user code. Consider this example: float foo(float a, float b) { return pow2(a) - pow2(sqrt(b)); } float bar(float c) { return foo(sqrt(b), b); } The author *should* be able to assume that for any positive c, the only possible output val...

There's a bit of a symmetry issue, which may or may not be important (led to 15 seconds of confusion until I got my bearings straight): row.names, rownames; colnames, no col.names? I _NOW_ realize the difference between row.names and rownames, but is there any reason not to have col.names for re-naming columns in a data.f...

On Tue, Dec 05, 2017 at 09:51:48PM +0200, Michael S. Tsirkin wrote: > On Tue, Dec 05, 2017 at 11:33:39AM -0800, Paul E. McKenney wrote: > > On Tue, Dec 05, 2017 at 09:24:21PM +0200, Michael S. Tsirkin wrote: [ . . . ] > > > and this barrier is no longer paired with anything until > > > you realize there's a dependency barrier within READ_ONCE. > > > >

On Tue, Dec 05, 2017 at 09:51:48PM +0200, Michael S. Tsirkin wrote: > On Tue, Dec 05, 2017 at 11:33:39AM -0800, Paul E. McKenney wrote: > > On Tue, Dec 05, 2017 at 09:24:21PM +0200, Michael S. Tsirkin wrote: [ . . . ] > > > and this barrier is no longer paired with anything until > > > you realize there's a dependency barrier within READ_ONCE. > > > >

...SIGNED MESSAGE----- Hash: SHA1 Hi, Albert Graef wrote: > Andreas Neustifter wrote: >> Well it does look not too good the text is getting to small in this >> case, what do you think of this 128x128 version? > > Hmm, that one has its left wing cut off, that wreaks havoc on the symmetry. > > The 136x136 version at http://llvm.org/Logo.html seems perfect for > websites, though. It only lacks the text. What font did you use? I used the default Ubuntu Serif font. This font is used to render the LLVM Homepage in Firefox on my boxes so it speaks LLVM to me. I made a couple o...