similar to: Deriv and integrate

Dear R users, I would like to calculate a cumulative sum as following: on the i-th row, in the j-th column of a matrix, I would like to obtain the sum of the (i-1) preceding elements of this j-th column. Could I avoid a "for" loop? Thank you, Tristan Lorino ---------------------- ?cole Nationale V?t?rinaire d'Alfort - http://www.vet-alfort.fr, T?l. 01 43 96 70 33 M?l. tlorino at

Hi, About GUI and R, I would say that personnaly, I need to build a nice GUI for people who does not know anything about R, to conduct simulations. I don't know if the choice of R is the best. Maybe writing all the code in Java would be better... I don't know. That's why I have tried to install RSJava from Omegahat on my computer (Windows 2000). With R 1.5.0 or 1.5.1, I get the

Hi, I would create a function rdiscrete that returns the value of a discrete random variable X defined on a subset which can change, and for the same probability for the issue, eg: X could sometimes take a value in the subset {2,3,4} with probability 1/3 for each issue, and sometimes X could take a value in the subset {2,3,4,5,6} with probability 1/5 for each issue, etc. The function should have

Dear R users, Is it possible to install RMySQL package with R 1.5.0 on Windows 2000 platform? This package is not listed in the packages list after calling "load package from CRAN" menu... Thank you for your help, Tristan Lorino ---------------------- ?cole Nationale V?t?rinaire d'Alfort - http://www.vet-alfort.fr, T?l. 01 43 96 70 33 M?l. tlorino at vet-alfort.fr Site personnel

Dear R users, I'm working with Windows 2000 and R -- note that I could maybe work with Linux too... I would like to know if it is possible to build a stand-alone statistical package which: -- could be programmed in R language, -- could have a nice graphical interface with buttons and menus (this package will be distributed to non-statistician people), -- could realize statistical operations,

Dears users, Thanks for your responses concerning my question of yesterday (about stand-alone package). Il would like to explore two ways: -- Tcltk extension, -- Rweb application. I have installed ActiveTcl (in F:\Tcl), and I have modified the PATH (in the autoexec.bat file): set R_LIBS=F:\R\rw1050\library set PATH=%PATH%;F:\Tcl\bin set PATH=%PATH%;F:\Tcl\lib set PATH=%PATH%;F:\R\rw1050\bin

Dear R users, I was happy to find a binary library for SJava in the last released of R (1.5.1)... I am able to load the library... but I have some problems to run this library: > .JavaInit() Error in .JavaInit() : Couldn't start Java Virtual Machine: Can't create Java Virtual Machine > javaConfig() $classPath [1] "F:/Program

Dear R-gurus, I have an interpretation problem regarding lme models. I am currently working on dog locomotion, particularly on some variation factors. I try to figure out which limb out of 2 generated more dispersed data. I record a value called Peak, around 20 times for each limb with a record. I repeat the records during a single day, and on several days. I tried to build two models, one

Hello, Instead of receiving only one message when somebody send a question or a answer, I receive 2 messages with exactly the same contents inside. Is it the same for you? Thank you, Fanny -------------------------- Fanny AZIZA École Nationale Vétérinaire d'Alfort Mail: faziza@vet-alfort.fr Tél. 01 43 96 70 33 [[alternate HTML version deleted]]

> Dears users, > I'm trying to run R on a computer with OS X. I installed the R folder > and the dylibs, where they must be installed. I updated my path, and > R runs but tells me : > > dyld: /usr/local/R-1.4.0/lib/R/bin/R.bin version mismatch for > library: /usr/lib/libz.1.dylib (compatibility version of user: 1.1.3 > greater than library's version: 1.0.0)

Dear all, I am looking at habituation of dogs trotting on a treadmill. I record the ground reaction force and I analyze it with several discrete variables (maximum, minimum,...) For each variable, I get between 40 and 50 data per sample. I record data at time 1 min, 2 min, and 4 min a day, and I have 4 days of measurement (one day a week). That means I have 12 samples : Day1_Min1, Day1_Min2,

Dear all, I try to compare the performances of several parameters to diagnose lameness in dogs. I have several ROC curves from the same dataset. I plotted the ROC curves and calculated AUC with the ROCR package. I would like to compare the AUC. I used the following program I found on R-help archives : From: Bernardo Rangel Tura Date: Thu 16 Dec 2004 - 07:30:37 EST

I might be missing something but I thought that AUC was a measure for comparing ROC curves, so there is nothing else needed to "compare" them. The larger AUC is the higher correlation of 2 variables compared. No other measures or calculations are needed. Jarek Tuszynski -----Original Message----- From: r-help-bounces at stat.math.ethz.ch [mailto:r-help-bounces at stat.math.ethz.ch] On

Hi!! Im doing my graduated work in Onion Curves Growth with Nonlinear Models, I'm amateur in R so i have doubt how i put or program next models, http://r.789695.n4.nabble.com/file/n3236748/96629508.png Also, i cant derivate for Gauss Model, and Richard Model dont have funtion, If someone could help me, i was so grate, -- View this message in context:

Hi, I have a strange problem while using WebService API which expects an ActiveRecord derivate. This is the code of the API ... ------ class HarvesterApi < ActionWebService::API::Base api_method :send_measurand, :expects => [{:measurand => Measurand}, {:eaiSystemName => :string}] end ------ ... and this of my Model ------ class Measurand < ActiveRecord::Base

Hello expeRts, I need generate symbolize the autocovariances matrix of a Gaussian ARMA(1,1), for derivate it and evaluate. I try this codes, but whitout sucess vacv<-NULL vacv[1]<-1-2*phi*theta-theta^2 vacv[2]<-(1-phi*theta)*(phi-theta) vacv[3:n]<-acv[2]*(phi^(1:(n-2))) facv<-list() for(i in 1:2)

Hi, I'm a student studing for Math. & Infor. Ing. in Tirana,Albania and a have a final project in R to finish in a week, so I badly need your help... The topic of the project is "Hermite Interpolation" and a I have allready done a script that finds the approximation in a certan point x, H(x) ~f(x) but i want to find the value of his derivative H'(x)~f'(x) as well and to

Dear everyone, the following is obviously used to compute the nth derivative, which seems to work (deriv(sqrt(1 - x^2),x,n)) However, before using this, I wanted to make sure it does what I think it does but can't figure it out when reading the ?deriv info or any other documentation on deriv for that matter: deriv(expr, namevec, function.arg = NULL, tag = ".expr", hessian = FALSE,

Dear list, Hi, I am trying to get the second derivative of a logistic formula, in R summary the model is given as : ### >$nls >Nonlinear regression model >model: data ~ logistic(time, A, mu, lambda, addpar) >data: parent.frame() > A mu lambda >0.53243 0.03741 6.94296 ### but I know the formula used is #

Dear ExpeRts, I have trouble implementing a function which computes the k-th derivative of a specified function f and returns it as a function. I tried to adapt what I found under ?deriv but could not get it to work. Here is how it should look like: ## specify the function f <- function (x,alpha) x^alpha ## higher derivatives DD <- function(expr, variable, order = 1) { if(order <