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I often use Lyx/Sweave and I typically write in english. Today I had to write a document in Italian and, as many of you know, many italian popular words use ?, ?, ?. ?, etc. I discovered that if I type in Italian (that is there is at least one letter with accent) with the Sweave module selected lye is not able to correctly compile the document. I tried to change the input encoding, but it

Dear all, I need to solve the following Lyapunov Matrix equation: C=ACA' + B, with A and B given square symmetric matrices. Does anyone knows of a package that can solve the lyapunov matrix equation in R? Or even a C/Fortran implementation? I did not find one on netlib. Thank you.

I have the following situation. H12 is an array of dimension (n,k,m) and hessian_lambda is a numeric of length m. I need to multiply each matrix H12[,,1], H12[,,2], ..., H12[,m] by hessian_lambda[1], hessian_lambda[2], ..., hessian_lambda[m], respectively, and then add the resulting (n,k) matrices. What I am using at the moment is the following code: H <- matrix(0, n, k) for(j in 1:(m)) {

I have a function in R^2, say f <- function(x,y) { ...skipped } I want to plot this function using contour, persp. wireframe, etc. I know that the function has a global minimum at (x0, y0) The naive approach is to evaluate the function on the outer product of two arrays, like this: sx <- c(seq(-3, x0, len = 100), seq(x0, 3, len = 100)[-1]) sy <- c(seq(-3, y0, len = 100), seq(y0, 3,

Hi, can anybody point me to a package with C++ code that call Fortran subroutines? I am trying to do the same thing but we scarce success. Error in dyn.load("utils.so") : unable to load shared library 'utils.so': dlopen(utils.so, 6): Symbol not found: _robcovf Referenced from: utils.so Expected in: dynamic lookup [[alternative HTML version deleted]]