similar to: A matrix multiplication

Hi! Maybe this is a silly question, but I need the column rank (http://en.wikipedia.org/wiki/Rank_matrix) of a matrix and R function 'rank()' only gives me the ordering of the elements of my matrix. How can I compute the column rank of a matrix? Is there not an R equivalent to Matlab's 'rank()'? I've been browsing for a time now and I can't find anything, so any

Hi there! I need some assistance here with vector orderings. I have a set of q vectors of length p, grouped by rows in a matrix A, q?p, that I need to order lexicographically (http://en.wikipedia.org/wiki/Lexicographical_order). I also have another matrix B, p?r, and a vector c, that should be ordered according to the order of A. So far, I was doing ordering <-

Hi there! Still struggling to translate Matlab code into R's tsDyn package. Here is my question: Is there in R an equivalent function to Matlab's prctile()? To the moment I thought it was quantile(), but I just realized I was wrong. The definition of the Matlab function: prctile Percentiles of a sample SyntaxY = prctile(X,p) Description Y = prctile(X,p) calculates a value that is

Hi! I want to plot three graphs (residuals, ACF and PACF of a model). Ideally I would use a c(2,2) disposition where the residuals plot would start at position 1,1 and span to position 1,2. Then I would plot the ACF in position 2,1 and the PACF in position 2,2. Maybe is clearer like this: -------------------------- | | | residuals | |

Hi there! I can't find any information about creating combinations with repetitions in R. The function combn() does create combinations, but _without_ repetitions. Here is what I need to do: svIter <- 1000 xx <- matrix(rnorm(m*n), c(m, n)) sequence <- seq(range(xx)[1], range(xx)[2], length.out = svIter^(1/q)) expand.grid(secuence, secuence, .../q times/..., secuence) That is,

Hi! I'm translating some code from Matlab to R and I found a problem. I need to translate Matlab's function 'lsqnonlin' (http://www-ccs.ucsd.edu/matlab/toolbox/optim/lsqnonlin.html) into R, and at the beginning I thought it would be the same as R's 'optim'. But then I looked at the definition of 'lsqnonlin' and I don't quite see how to make

Hi! I've been browsing through the last months' archive and I can't find an answer to my question, so here it is (let's hope it's not too obvious): I'm working on extensions of an R library, and I would be very surprised if everyone developing R packages is doing the following, as I do: 1.- Write down a modification of an R file 2.- Exit the current R

Estimado Jesús Para Fernández En teoría es ese material, lo vi muy rápido y en la parte genética tiene cosas que biológicamente no son así, hay un libro de Falconer, Introducción a la genética cuantitativa, que tiene escrita la parte matemática, hay un abismo entre la biología y los ingenieros que se inspiran en la biología. Yo pensaba en la resolución de un problema real, aunque relativamente

Estimados. Hace un tiempo que tengo una duda, estaba pensando en los problemas como optimización de costos, donde hay varias alternativas y librerías, pasando por soluciones inspiradas en energía, genética o algo matemático como matrices y álgebra. Luego aparecen tensorflow, cntk, y otros tantos, de los cuáles https://keras.rstudio.com/ ofrece alternativas para mezclar los mundos por decirlo de

Hello! At the University of Granada (Spain) we use a Samba Server for aprox. 1000 users and runs ok. But (there's always a but) we need to know how encript password for the smbpasswd file. I know that we can use the smbpasswd program but we need get the encrypted password in the stdout. Has someone a program than does this?? TIA.

Dear Sir, I have been working with R for some time now and I am very happy with it, but I have found a problem that I could not resolve. Could you please give me some hint about how to transform POSIX time data in seconds to string format?. (eg. 995752800 -> year-month,day,hour,min, sec) I tryed with Sys.time(), strptime() and date() but without success. Thank you very much in advance

I tried to intall R in a iMac with Mac OS E1- 9.0.4 (Mac OS ROM VE-4.6.1). When I tried to run R for the first time I got a message about "Carbonlib-- CF RangeMake" not beeing found. Please, could you help me to tackle the problem. Thanks very much. Barahona -- Enrique Barahona Fernandez ESTACION EXPERIMENTAL DEL ZAIDIN, CSIC Profesor Albareda, 1 18008, GRANADA (Spain) Tel. + 34

Dear sir, we would like to know if there exist any R package containing the computational performance of the n-fold Stieljes' convolution of functions. We look forward to hearing from you. Thank you in advance. ____________________________________ M.Luz G?miz P?rez Dpt. Estad?stica e Investigaci?n Operativa Facultad de Ciencias Universidad de Granada Telf.: 958-243156 e-mail:

Hi all!. First of all sorry about my English it''s not very fluid. I have a small server based upon Supermicro X7DBN (Chipset Intel® 5000P) motherboard and Intel Xeon E5320 (1,83Ghz) with 4Gb of FB-DIMM RAM. The OS is Debian Lenny in dom0 (2.6.26-2-xen-amd64) and Debian Lenny in domU (2.6.26-2-xen-amd64). Xen is 3.4.2 compiled from sources. The problem comes when I need to passthrough

Hi again! I'm using the 'optim' method to fix the parameters of a model. I have written the function to be minimised and another function which returns the gradient of the error. Now my problem is that, in order to compute that gradient, it would be extremely convenient to be able to pass some parameters to the gradient function. I don't see how to do it given the fixed syntax

Buenas tardes a todos. Mi problema es el siguiente: Calculo una muestra de unos índices (s) y a partir de esa muestra elijo aquellos elementos de una tabla de datos que tengo (en este caso XP4) que cumplen la condición de que el índice de XYP sea el de la muestra. Ahora comienza mi problema, la única forma que he encontrado para que me R me tome todos los elementos que necesito es creando un

Hola: El 02/07/14 a las #4, Jose Luis Cañadas Reche escribió: > [...] > Ya de paso pregunto si alguien está interesado en > hacer un GIL (Grupo de Interés Local) en Andalucía.. ¿En que zona tienes interés? En Almería no hay muchos eRReros pero alguno que otro estamos. Salud y Revolución. Lobo. -- Libertad es poder elegir en cualquier momento. Ahora yo elijo GNU/Linux, para no

Hi, I'm trying to use a similarity matrix (triangular) as input for pam() or fanny() clustering algorithms. The problem is that this algorithms can only accept a dissimilarity matrix, normally generated by daisy(). However, daisy only accept 'data matrix or dataframe. Dissimilarities will be computed between the rows of x'. Is there any way to say to that your data are already a

Hola. Tengo algún tipo de problema con las tildes, a la hora de trabajar en R o en RStudio, que no sé resolver. Intentando reproducir en dos PCs distintos, ambos con Windows 7, uno de los últimos ejercicios que ha publicado Carlos Gil Bellosta en su blog ( https://www.datanalytics.com/2016/06/20/6602-767-km-alrededor-de-espana-para-visitar-todas-sus-capitales-de-provincia/), me ocurre que al

Hola a todos Me gustaría pasar directamente tablas a latex, he probado con Sweave pero no consigo dar con la tecla Saludos -- José Miguel Contreras García Departamento de Didáctica de la Matemática Universidad de Granada Campus de Cartuja 18071 Granada (España) Email: jmcontreras en ugr.es http://www.ugr.es/~ jmcontreras Tlf: 958243952