search for: escriu

Hi every one. I'm learning how to use sapply (and other function of this family). Here's what I'm trying to do. I have a vector of lets say 5 elements. I also have a matrix of nX5. I would like to know how many element by column are inferior to each element of my vector. On this example: v = c(1:5) M = matrix(3,2,5) I would like to have a vector at the end which give me 0 0 0 2 2

Dear all, I am trying to multiply three different matrices and each matrice is of size 16384,16384 the normal %*% multiplciation operator has not finished one day now. As I am running a system with many cores (and it seems that R is using only one of those) I would like to write fast a brief function that converts the typical for loops of a matrix multiplication to a set of lapply sets (mclapply

Hi, I was wondering if there's a function in R that is meant to return a string representation of an object. Basically, it's like print() but it doesn't print anything, it only returns a string. I know there's a str() function but it's not quite the same. I mean a function that returns the same string that print() would display. -- Bye, Ernest

Hello R-users,    I have a data frame whose names of columns I don't know a priori, but the user of my code will know them. The user is supposed to save the name of the column that will need some reordering of the levels of the factor later on. The name of the column will be saved in an object called: variab the data frame is called df. If I try to the do following:

Hello, I have a matrix of 17 rows and 20 columns. I want to replicate this matrix 20 times, but I only want to replicate the rows. How do I do that? Kind regards / Met vriendelijke groet / Med venlig hilsen, Dr. Gijs Schumacher Postdoctoral Researcher Department of Political Science and Public Management, University of Southern Denmark & Department of Political Science, VU University

Dear all, I know this problem was discussed many times in forum, however unfortunately I could not find any way out for my own problem. Here I am having Memory allocation problem while generating a lot of random number. Here is my description: > rnorm(50000*6000) Error: cannot allocate vector of size 2.2 Gb In addition: Warning messages: 1: In rnorm(50000 * 6000) : Reached total allocation

Hello, Currently it's possible to convert an object of class table to a data frame with as.data.frame.table(), but there's no ready-made function, AFAIK, to do the reverse operation, i.e. conversion of a data frame to a table. Do you think it would be a good idea to add a data.frame method to as.table(), to allow such conversions? The idea is that if `x' is a table and `y <-