search for: kibbitz

...rticularly parameter bounds, on parameter inputs to optimization. There is quite a lot of activity going on right now with optimization in R. With Ravi Varadhan, Kate Mullen and Paul Gilbert, I've been putting some codes on R-forge in the OptimizeR project. Doug Bates has done some important kibbitzing. Stefan Theussl and others have the R Optimization Infrastructure. There are some differences of focus in these projects. For the present poster, I cannot unfortunately help much on GNLM details, but I can say that there are trial versions of methods that will handle bounds (packages minqa,...

...e Matrix package, but as a shorter-term solution, it could be useful to put together a suite for dense matrices. Using existing Fortran codes would allow this to be done fairly quickly and it could be a nice summer or term project for a student (Google Summer of Code 2013?). I'll be happy to kibbitz and mentor, but I'd rather stay on the sidelines of actual package building, as I no longer have a direct need. My application was the quantum electronic structure of polymers in 1972/3. However, I think the code is still reasonable. Best, JN On 04/23/2012 06:00 AM, r-help-request at r-pr...

Hi all, I've been doing some LLVM development recently, as was curious about the status/feasibility of allowing developers to write out-of-tree back-end passes (e.g. `MachineFunctionPass`es) in a matter similar to middle-end passes. From the limited resources I can find online[1][2][3], LLVM currently doesn't support building back-end passes outside of the source tree. Could anybody more

Dear Sirs: Please pardon me I am very new to R. I have been using MATLAB. I was wondering if R would allow me to do principal components analysis on a very large dataset. Specifically, our dataset has 68800 variables and around 6000 observations. Matlab gives "out of memory" errors. I have tried also doing princomp in pieces, but this does not seem to quite work for our approach.