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Dear Jun I think you should consider to submit your question to R-SIG (special interest group) about spatial data http://r-sig-geo.2731867.n2.nabble.com/ This will improve the probability you get some help. Cheers Giuseppe Calamita...

zhijie zhang wrote > > ..... > #-----My problems are as follows.------# > #Method1-Error > # perform ordinary kriging prediction-errors? > v <- variogram(g) > Who is 'g'?? you forget to show us how you defined-created the g object. ----- Giusepep Calamita PhD italian National Council of...

I never worked with geoR package for interpolation pourposes. Have you already checked the gstat package ? Further, do you have any idea of which model would be the best for fitting the data you're working on (exponential, spherical, gaussian...

I would like to perform a bootstrap validation of a backward stepwise logistic regression analysis, but I am a beginner with R and I am not sure of how to do it. Is there anyone that can send me a...

Hi Piero! :) I also tried the code from Hengl's book and running rsaga.* commands didn't work. I guess that with newer versions of SAGA syntax may be changed. Did you already check in the official documentation of SAGA...

Hi Ethienne, we (me and Gab) would like to thank you ! Finally we got what we were looking for but we did it without use the "raster" package....but we are going to try also with it to see if...

Hi, i'm searching for an R library able to calculate the Regression Error Characteristic Curves as explained in: http://www.google.it/url?sa=t&source=web&cd=1&ved=0CBgQFjAA&url=http%3A%2F%2Fciteseerx.ist.psu.edu...

I have the following situation. H12 is an array of dimension (n,k,m) and hessian_lambda is a numeric of length m. I need to multiply each matrix H12[,,1], H12[,,2], ..., H12[,m] by hessian_lambda[1], hessian...

Hi Waltenegus, you should consider to show us your code and the data you used to fit the curve. If you can't or if you prefer you can simply show the code and some sample data on which the...

hi, my name is giuseppe and i am an engineer, i am using R for regressions analysis using mixed random effects model, funztion "nlme". quastions are: 1) when i ask for the summary after a regression using nlme function the...

Hi, this happen when two or more packages have functions with the same names. Using search() you can see which package are loaded in your working environment. Thus, using the name of the function will call the function of the...

Hi, I have a digital elevation model (raster) and the derived river network (SpatialLinesDataFrame) and I would like to plot them in 3D (the dem and on top the river network). I use the command plot3D(dem) from the rasterVis...

He, I used the "coxph" function, with four covariates. Let's say something like that > model.1 <- coxph(Surv(Time,Event)~X1+X2+X3+X4,data=DATA) So I obtain the 4 coefficients B1,B2,B3,B4 such that h...

Dear all, I am trying to put together in a package some functions that maybe of interest to other. A particular function of the package uses "zgges" from Lapack with a .Fortran call. Since R does not load all symbols...

Thank you very much Rainer, the first option you suggested (unistall RSAGA and instasll it again) didn't seem to work. I uninstalled the 2.07 and I installed the 2.08 (I had to compile it on ubuntu 10...

Hello to All. I'd want to use a one-way ANOVA. This means that I have only one factor, with, lets say, 5 levels. I made a dataframe, called "DATA", with two Columns: A, that is my response, and...

Hi, can somebody tell me why R is not able to calculate a linear model written in this way? > lm (seq(1:100)~seq(1:100)) Call: lm(formula = seq(1:100) ~ seq(1:100)) Coefficients: (Intercept) 50.5 Warning...

Dear all I would like to have some data in the form of a 2-dimensional array (matrix) of lists, so that I can easily find the desired list object by indexing the structure by rows and columns. In matlab...

Hello, I would like to know if anyone has encounter this problem before and what they have done to solve the problem. I am not sure if the problem has to do with R itself or with RStudio. The problem...

I am using the mice package to impute some missing values, and it work nicely. I am facing a tricky strategic question though. Basically, I am working on predictors of myocardial infarction, with all patients having baseline features (eg age...