search for: fnorm

Hello R users, I am trying to estimate the parameters of a bimodal normal distribution using moments matching, so I have to solve a non-linear system of equations. How can I solve the following simple example? x^2 - y^2 = 6 x ? y = 3 I heard about nlsystemfit, but I don?t know how to run it exactly. I have tried the following code, but it doesn?t really work: f1 <-y~ x[1]^2-x[2]^2-6 f2

Installing odesolve in Raqua 1.8.0 or 1.8.1 under MacOSX gives the following message: Warning message: Installation of package odesolve had non-zero exit status in: install.packages(ui.pkgs, CRAN = getOption(where), lib = .libPaths()[1]) Moreover, in the source of odesolve is no makefile. Does anyone know how to get a proper installation? Maartje

Dear all, Has someone implemented in R (or any other language) Knol DL, ten Berge JMF. Least-squares approximation of an improper correlation matrix by a proper one. Psychometrika, 1989, 54, 53-61. or any other similar algorithm? Best regards Jens Oehlschl?gel Background: I want to factanal() matrices of polychoric correlations which have negative eigenvalue. I coded Highham 2002

...-o cfode.o gfortran -fpic -g -O2 -c dgbfa.f -o dgbfa.o gfortran -fpic -g -O2 -c dgbsl.f -o dgbsl.o gfortran -fpic -g -O2 -c dgefa.f -o dgefa.o gfortran -fpic -g -O2 -c dgesl.f -o dgesl.o gfortran -fpic -g -O2 -c ewset.f -o ewset.o gfortran -fpic -g -O2 -c fdump.f -o fdump.o gfortran -fpic -g -O2 -c fnorm.f -o fnorm.o gfortran -fpic -g -O2 -c i1mach.f -o i1mach.o gfortran -fpic -g -O2 -c intdy.f -o intdy.o gfortran -fpic -g -O2 -c j4save.f -o j4save.o gfortran -fpic -g -O2 -c lsoda.f -o lsoda.o gcc -std=gnu99 -I/usr/share/R/include -I/usr/share/R/include -fpic -g -O2 -c odesolve_utils.c -o odesolve_...

Can someone help me understand the following: > D(expression(dnorm(x, mean)), "mean") [1] 0 > sessionInfo() R version 2.2.1, 2005-12-20, i386-pc-mingw32 attached base packages: [1] "methods" "stats" "graphics" "grDevices" "utils" "datasets" [7] "base" By my computations, this should be