search for: emammendes

Hello I have a matlab MAT file that contains one single variable: a. The structure of a is as follows: a.river1.flow (flow values) a.river1.date_flow (date) a.river1.precip (precipitation values) a.river1.date_precip a.river2.flow a.river2.date_flow a.river2.precip a.river2.date_precip I have used readMat to load the variable a in R, however I have no idea how readMat translates a. I managed

Hello I am new to R and I need to convert some dates (numeric format by matlab) to actual dates in R. For instance, Matlab -> 730456 -> >> datestr(730456) ans = 02-Dec-1999 R - > library(zoo) > as.Date(730456) [1] "3969-12-03" I don't not mind the output format but it needs to be right. Many thanks Ed

Dear R-users I need to fit a nonlinear model to a piece of data. The model to be fitted uses past values of the input and the ouput - something like y(k) ~ f(y(k-1),y(k-2),u(k),u(k-1) ....) (k is time index). As far as I know I could use earth(MARS), nnet and etc but I am not sure how to deal with the past values since most, if not all, examples I saw formula does not take in account past

Hello Please see the example below > class(testX) [1] "matrix" > class(testX[1,]) [1] "numeric" Why not matrix? What am I missing here? Is there a way to keep the same class? The reason for the question is that I want to implement a k-step ahead prediction for my own routines and R wrecks does not seem to like [1,] as shown below. >

Hello I have recently upgraded R to the newest version. Unfortunately my old (fortran and C) R-package cannot be installed anymore (was built before R 3.0.0: please re-install it). I have tried R CMD INSTALL package_name but I noticed that R-3.1.1-binary-mac requests gcc-4.8.2 and specific locations for the libraries (gcc and gfortran). Can someone point me to the documentation on how to

Hello I need to run an r-file that works on Windows on MAC. The first lines of the file are: library(R.matlab) library(Rcompression) Somehow I cannot find where Rcompression is. Am I missing something? Many thanks Ed

Dear R-Users I have the following matrix > out$desc [,1] [,2] [1,] "" "" [2,] "y_{01}(k-001)" "" [3,] "y_{01}(k-002)" "" [4,] "y_{01}(k-003)" "" [5,] "u_{01}(k-001)" "" [6,] "u_{01}(k-002)" "" [7,] "u_{01}(k-003)" ""

Hello I wonder how I could get my linux box to serve logins to a Windows Me box. At the moment samba is running but I cannot access home dirs (No user log on). Since ME (wireless card DWL+G520) accesses an AP (DI 624 - 192.168.0.1 + ADSL) and the card manager comes up at end of the booting process, I have no idea how to get a user log on box (To be honest I don't know if this is

Dear R-users I am new to R and struggling not to bother the list with silly questions. I read the documentation on xts and searched for some examples over the internet on how to use plot.xts. The xts object is as follows dataxts : An 'xts' object from 2010-06-27 to 2010-08-05 containing: Data: num [1:56161, 1:14] 74 74.2 74.2 74.1 73.9 ... Indexed by objects of

Hello R is pretty new to me. I need to write a function that returns three matrices of different dimensions. In addition, I need to call a function from a contributed package with the function. I have browsed several manuals and docs but the examples on them are either very simple or extremely hard to follow. Many thanks Ed [[alternative HTML version deleted]]

Hello I have a huge file (not an R-file) in which the first column is a string with date, hour, minutes and seconds (For instance, "31-Jul-2010 23:59:00"). I tried as.Date but the error msg was "Error in charToDate(x) : character string is not in a standard unambiguous format". I have checked the help for the function as well as date but to no avail. How can that sort

Dear R-users I am trying to recompile a CRAN package on Windows 32. Rtools for 2.14 (that is the version I am running) and miktex were sucessfully installed on my machine. Problems: a) hydroGOF is a CRAN package, but R CMD check does not work on it. C:\Users\eduardo\Documents\R_tests2>R CMD check hydroGOF * using log directory 'C:/Users/eduardo/Documents/R_tests2/hydroGOF.Rcheck'

Hello I could not find whether there is any R-function that implements the inverse of a noncentral Beta. Could someone out there tell me where I can find it? Or how to implement it? Many thanks Ed [[alternative HTML version deleted]]

Dear R-Users I think I am getting the hang of how sweave works. However there is one thing I am struggling with - nice small size graphics. Here is the piece of the Rnw file that creates the figures. <<pl1,fig=TRUE,include=FALSE,echo=false>>= #pdf(file="datapl1.pdf",paper="a4",width=0,height=0); plot(yt,ypred,xlab="Data",ylab="Predicted

Hello I do not think I have fully grasped how to use Amelia to deal with missing data. For instance, suppose I have a data.frame variable with 4 columns (year, mon, ssn, dev) = (year, month, measurements, standard deviation of the measurement). Of course, there are some random missing values on columns 3 and 4. The measurements are an almost periodic time-series contaminated by noise.

Hello I wonder whether there is an r tool or package available for testing for the null of same skewness or kurtosis of two independent samples. It semes that nsRFA package uses L-moments for soothing similar but I could not get how to use the package for the above test. Any pointers, help, example and etc. will be most welcome. Many thanks Ed [[alternative HTML

Hello I have the following problem when loading the package hydroGOF on Windows 7 running R.12.2 library(hydroGOF) Error : package 'hydroTSM' does not have a name space Error: package/namespace load failed for 'hydroGOF' The same command does not result in error on R.13.1 at my Mac running Lion. Have I done something wrong? Many thanks Ed

Dear R-Users I have come across the error that apparently has nothing to do with command itself. Here is the error (w - matrix (or vector) e testXaxis - dates). > plot(data.frame(testXaxis,w),col="blue",ylab="Q, [m3/s]",xlab="Data", + main="Free-run - Modelo NARX MISO - Test Data") Error in gzfile(file, "wb") : cannot open the

Hello I am running R versions 2.13 and 2.15. One of my codes run ok on 2.13 but on 2.15. I have tried to understand what is wrong but come up with nothing. Here is the code rm(list=ls()) graphics.off() library(R.matlab) library(zoo); library(xts); library(lattice); library(hydroGOF); a=readMat("exemplo_narmax_Aimores_MISO.mat")

Dear R-users I am slowly migrating my mex files (MATLAB - Fortran and C) to R. To get my own functions available on R section I have decided to learn how to build a R package. I choose a simple example with a few Fortran and R functions (wrapper). The fortran sources are located at src and the R functions at R (as recommended). The building process went ok but R CMD check did not. The error