search for: erfs

Hi, I created a function for obtaining the normal cumulative distribution (I know all this already exists in R, I just wanted to verify my understanding of it). below is the code I came up with. cdf<-function(x) { erf<-function(x) { # approximation to the error function (erf) of the # normal cumulative distribution function # from Winitzki

Hi all. I may be wrong, (and often am), but in trying to determine how to calculate the erf function, the documentation for 'pnorm' states: ## if you want the so-called 'error function' erf <- function(x) 2 * pnorm(x * sqrt(2)) - 1 ## and the so-called 'complementary error function' erfc <- function(x) 2 * pnorm(x * sqrt(2), lower=FALSE) Should, instead, it read:

Do any of the R libraries have an implementation of the Inverse Error Function (Inverse ERF)? ref: http://mathworld.wolfram.com/InverseErf.html http://functions.wolfram.com/GammaBetaErf/InverseErf/ Thanks, Nathan [[alternative HTML version deleted]]

how R implement qnorm() I wonder anyone knows the mathematical process that R calculated the quantile? The reason I asked is soly by curiosity. I know the probability of a normal distribution is calculated through integrate the Gaussian function, which can be implemented easily (see code), while the calculation of quantile (or Zα) in R is a bit confusing as it requires inverse error function (X

Full_Name: Benjamin Leblanc Version: 2.4.1 and 2.5.0 OS: Ubuntu Linux 7.04 AMD64 Submission from: (NULL) (195.83.84.213) Here is an example script that may crash under R with Linux AMD 64 bit platforms library('NORMT3') a <- 1:1000/1000 erf(a) I did several tests: - opensuse 10.2 x86_64 with R 2.4.1 and R 2.5.0, produce systematically a frozen R session - ubuntu 7.04 AMD64, R 2.4.1

...d precisely in relation to the onset of the cue. Each of these segments is known as an 'event-related field' or ERF and the segments for every cue left or cue right trial were averaged across trials (to improve signal-to-noise of the event-related activity). We have data that are averaged ERFs over several hundred trials. These averaged ERF for cue left or cue right was used to estimate the brain source activity (the details are not relevant here). A small example dataset and R scripts are available via ftp://ftp.mrsc.ucsf.edu/pub/dweber/cortical_timeSeries.tar These example data are...

Hi, I have a dataset that looks like the one below. data plot plantno. species H 31 ABC D 2 DEF Y 54 GFE E 12 ERF Y 98 FVD H 4 JKU J 7 JFG A 55 EGD . . . . . . .

Hallo Liste, hat sich schon mal jemand mit 2 Faktor Auth f?r dovecot besch?ftigt? Es geht dabei nicht nur um die Absicherung einer Weboberfl?che sondern direkt die Absicherung der Standard pop/imap Verbindungen des Clients. Wir machen das auth bisher ?ber MySQL.? Rein technisch w?rde das gehen, da man die Password-Query beliebig anpassen und auch mit allow_nets arbeiten kann. Es w?re eher die

On 6 November 2012 14:52, Duncan Sands <baldrick at free.fr> wrote: > Hi Anitha, > > > On 06/11/12 10:19, Anitha Boyapati wrote: > >> Hi Duncan >> I am facing a build error about __builtin_iceil >> > > it's surely just that dragonegg doesn't have any support for this builtin. > ok. Just verified that Target.cpp and x86_builtins do not have

Hi Duncan I am facing a build error about __builtin_iceil when compiled with dragonegg using -ffast-math option. My dragonegg is built with gcc-4.7.0 (I am compiling namd spec benchmark here again). Any idea? g++ -march=bdver2 -save-temps -fplugin=/home/anboyapa/install/bin/dragonegg.so -O2 -march=bdver2 -save-temps -fplugin=/home/anboyapa/install/bin/dragonegg.so -mno-fma -mfma4 -ffast-math

hi all, Does anyone know which command to use for error function(erf)? Thanks

Hi Anitha, > it's surely just that dragonegg doesn't have any support for this builtin. > > ok. Just verified that Target.cpp and x86_builtins do not have iceil support. > I have this tricky situation - I use dragonegg generated LLVM IR as input to > clang for some analysis (well it is clang++ actually). Understably,clang cribs > looking at __builtin_iceil. Any idea

Hi all, Looking to calculate the expected mean and variance of a ratio distribution where the source distributions are gaussian with known parameters and sample values are correlated. I see (from wikipedia: http://en.wikipedia.org/wiki/ Ratio_distribution#Gaussian_ratio_distribution) that this calculation is quite involved, so I'm hoping that someone has already coded a function to

Hi Anitha, On 06/11/12 10:19, Anitha Boyapati wrote: > Hi Duncan > I am facing a build error about __builtin_iceil it's surely just that dragonegg doesn't have any support for this builtin. Please open a bug report with a minimal test case. Ciao, Duncan. when compiled > with dragonegg using -ffast-math option. My dragonegg is built with gcc-4.7.0 > (I am compiling namd

I believe that this may be more appropriate here in r-devel than in r-help. The normal hazard function, or reciprocal Mill's Ratio, may be obtained in R as dnorm(z)/(1 - pnorm(z)) or, better, as dnorm(z)/pnorm(-z) for small values of z. The latter formula breaks dowm numerically for me (running R 2.4.1 under Windows XP 5.1 SP 2) for values of z near 37.4 or greater. Looking at the pnorm

Hi, I tried to compile und install wine from the current cvs snapshot. Compilation was fine, but tools/wineinstall stopped with this error message: ------------ [...] Compiling regapi... rm -f regapi && ln -s ../../wine regapi Preparing to install default Wine registry entries... Installing default Wine registry entries... wineserver: request.c:235: write_request: Zusicherung

Hi, The following script (which I did not develop) is used to calculate and plot a skewed normal curve. The script currently requires the user to input six parameters, rather than reading these directly from a file. I've been spinning wheels here, trying to figure out how to modify the script to automate it. I have four data sets, each in excess of 300 records that I need to process. My

Hello, Can someone point me to documentation on how to best backup a samba member server? I see the wiki currently does not contain one. Is it as simple as backup all shared folders with rysnc or similar that will preserve ACLS along with the smb.conf? I'm currently relying on a raid solution. Thanks. -- -James

Erf... Best backup are expensive :p Buy a backup robot, buy another one, put them in separated datacenters, which could on separated continent... I'm joking. But the question pushed me to. You can backup your data or backup your configuration. You can of course backup both. Then what configuration? I smb.conf enough? Do you have to backup your pam configuration too? I'd say you would

Dear all, The package NORMT3 which computes the erf, erfc functions as well as the exact values of the convolution of a Gaussian with a Student's t 3 distribution has been enhanced with the addition of a function to compute Faddeeva's function. Thanks to Krishna Myneni for this addition. Guy Nason [[alternative HTML version deleted]]