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Hello, all, It is a general question, but I couldn't find the answer elsewhere. I am using an R function using .C but don't understand one of its behaviors without the C code. I am wondering the so...

Hello, all, I had problems with an extension to a classic optimization problem. The target is to minimize a quadratic form a'Ma with respect to vector b, where vector a=(b',-1)', i.e., a is the expand of...

Thanks to Prof. Ripley and Henrique, gsub does do the job. In addition, we can use like gsub("\\\\345","aa", the column of the data frame) to replace all such characters in this column. By the way, I am using...

Hello, Berwin, Thanks a lot for answering! I prefer the first method, which seems easier to carry out. So, what I need now is some method to solve the non-linear equation c'(M_11-lam*I)^(-1) (M_11...

Hello, S-plus and R helpers,(sorry for cross-post) I wrote some simple C code for one likelihood to be optimized (using optim(MASS)). I use same function, same data, same starting points and same DLL in R and...