search for: ypma

...As the package is very new, I fully expect there are some deficiencies, and ask that users send executable examples so I can address same. optimrx doesn't (yet) have nloptr. It's on the todo list, but I've not been able despite many tries to get any response from its maintainer (Jelmer Ypma), who seems to have largely dropped out of R work, though there was a fairly recent minor adjustment on Github. However, no communication is a worry, as nloptr and also ipoptr are important tools that could use support. I've offered, but I don't have C++ expertise. If anyone is willing to w...

Dear list, The task view on optimization does not reference a package for non linear constrained optimization problems. Stefan Theussl told me to look at the Rsolnp package, but unfortunately it is not very clear what method is R ported. (The authors ported the matlab code of Yinyu Ye http://www.stanford.edu/~yyye/ <http://www.stanford.edu/%7Eyyye/>) Currently I'm looking for an

Dear all, I've been getting different results from the sparse and dense version of model.Matrix when used with sparse contrasts and interactions between factors. The same happens when using model.matrix and sparse.model.matrix. When calculating list.contrasts I get the same results for sparse and dense contrasts (except the type of the matrix is different of course). However, when I use these