search for: sordered

Hi Developers, I am looking for another new project to help me get more up to speed on R and to learn something outside of R internals. One recent R issue I have run into is finding a fast implementations of the equivalent to the following SAS code: /* MDPC is an integer sort key made from two integer columns */ MDPC = (MD * 100000) + PCO; /* sort the dataset by the key */ PROC SORT;

Hi, is there a R function that order a matrix according to some criteria based on the rows(or cols) of that matrix? For example, let's say that my matrix S is composed by n rows S_1, S_2,.., S_n and that I compute some real value g_i=g(S_i) for each row. Then I want to order this set of g_i (from smaller to bigger) and order the correspondent row to the new position. Is it possible (apart

...m> Cc: r-help@r-project.org Subject: Re: [R] ordering a vector Message-ID: <AANLkTikifs+5YxOpYeoajMKKU9SrwP8Pv=TtgedkHCgn@mail.gmail.com> Content-Type: text/plain; charset=ISO-8859-1 I think you want the following, assuming you defined your function g(): gValues = apply(S, 1, g); Sordered = S[order(gValues), ] Peter On Fri, Jan 21, 2011 at 11:38 AM, Francesco Petrogalli <francesco.petrogalli@gmail.com> wrote: > Hi, > is there a R function that order a matrix according to some criteria > based on the rows(or cols) of that matrix? > > For example, let's say...