Displaying 20 results from an estimated 3000 matches similar to: "erf function documentation"
2006 Jun 26
2
Inverse Error Function
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]]
2008 Apr 13
4
R equivalent of erfcinv in matlab
I am converting some matlab code into R that use inverse of the
complementary error function, erfcinv and did not find an equivalent in
R, is there such a function in some contributed modules?
Thanks.
2012 Oct 17
1
how R implement qnorm()
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
2007 Sep 13
2
Reciprocal Mill's Ratio
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
2007 May 14
1
Calling erf function in package NORMT3 produce a R crash on Linux/AMD opteron (PR#9683)
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
2008 Oct 06
1
Bug with message if there is no documentation; R2.8alpha Win32 (PR#13131)
In the latest R 2.8 alpha for Win32, if either of the commands are typed:
> help("erfc")
.. or ..
> ?erfc
the result is:
No documentation for 'erfc' in specified packages and libraries:
you could try '??erfc'
This should be: 'help.search("erfc")', as shown in R 2.7.2
Apologies if this has already been submitted/fixed.
-Mike
--please do not edit
2002 Nov 13
2
survreg (survival) reports erroneous results for left-censored data (PR#2287)
Full_Name: Tim Cohn
Version: 1.6.1
OS: Macintosh OS X
Submission from: (NULL) (130.11.34.250)
The Mac version of survreg does not handle left-censored data correctly (at
least the results are not what I get doing it other ways, and they are not the
same as I get running R 1.6.1 in Windows 98se; the Windows 98 results are
correct). On the windows version of R 1.6.1.
>
2011 May 19
2
recursive function
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
2009 May 16
1
maxLik pakage
Hi all;
I recently have been used 'maxLik' function for maximizing G2StNV178 function with gradient function gradlik; for receiving this goal, I write the following program; but I have been seen an error in calling gradient function;
The maxLik function can't enter gradlik function (definition of gradient function); I guess my mistake is in line ******** ,that the vector ‘h’ is
2006 Jan 03
1
need to know some basic functionality features of R-Proj
Hi,
I am new-comer to statistics and R-Project. I would like to know if these
features can be attained in R-Project.Please help.
1) beta 1 and Beta 2, or gamma one and gamma two for skewness and kurtosis,
respectively, including standard errors and tests for significance (relative
to values for a Gaussian distribution).
2) linear correlation
3) quadratic regression
4) polynomial regression
2010 Mar 17
0
NORMT3
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
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2010 Mar 17
0
NORMT3
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]]
2005 Feb 03
3
Reading Dates in a csv File
Hi all. I'm reading in a flat, comma-delimited flat file using read.csv.
It works marvelously for the most part. I am using the colClasses argument
to, basically, create numeric, factor and character classes for the columns
I'm reading in. However, a couple of the fields in the file are date
fields. I'm fully aware that POSIXct can be used as a class, however the
field must obey,
2007 May 24
2
Calculation of ratio distribution properties
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
2017 Nov 30
1
dovecot - 2 Faktor Auth
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
2006 Mar 18
1
Time-Series, multiple measurements, ANOVA model over time points, analysis advice
Hi,
I have some general questions about statistical analysis for a research
dataset and a request for advice on using R and associated packages for a
valid analysis of this data. I can only pose the problem as how to run
multiple ANOVA tests on time series data, with reasonable controls of the
family-wise error rate. If we run analysis at many small sections of a long
time-series, the Type-I
2018 Feb 06
2
libc++ cross-compile linux-armv7 and math function problems
Hello,
I am trying to cross-compile libc++ from my x86_64 linux system to armv7hf.
We have our own gcc compiler that we build with crosstools-ng (based on gcc
6.3.0) and I set my environment like this:
CC=armv7a-plex-linux-gnueabihf-gcc
CXX=armv7a-plex-linux-gnueabihf-g++
CFLAGS=-fPIC -DPIC -mfloat-abi=hard -march=armv7-a -Os -mfpu=vfpv3-d16
--sysroot=<path>
CXXFLAGS=-fPIC -DPIC
2018 Feb 06
0
libc++ cross-compile linux-armv7 and math function problems
At first glance, it looks like long double functions (such as fabsl and friends) are missing from your sysroot's <math.h>. Does your target support long double at all?
-Dimitry
> On 6 Feb 2018, at 09:51, Tobias Hieta via llvm-dev <llvm-dev at lists.llvm.org> wrote:
>
> Hello,
>
> I am trying to cross-compile libc++ from my x86_64 linux system to armv7hf. We have
2018 Feb 06
1
libc++ cross-compile linux-armv7 and math function problems
Hello Dimitry and thanks for your answer.
I am pretty sure it does indeed support long double. It's configured with
vfpv3-d16 - but I noticed that c++config.h in gcc has _GLIBCXX__HAS_FABSL
and friends are undefined. I think I need to look deeper at the
configuration of our toolchain.
long double support is required in libc++ then I gather?
-- Tobias
On Tue, Feb 6, 2018 at 11:47 AM,
2010 May 23
2
Subsetting with a list of vectors
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
. . .
. . .
.