search for: multidimensional

A student of mine wants to use R to do some nonmetric multidimensional scaling. According to the R FAQ, there's a package called pcurve that computes multidimensional scaling solutions, but I was not able to locate it the contrib page (I am a Windows user with R version 1.4.1). Can anyone tell me whether it is possible to do nonmetric multidimensional scaling wi...

Hello list. Another 'puzzle' for which I don't have a clean solution. Say I have a multidimensional object, e.g.: Mm<-matrix(1:6, nrow=2, dimnames=list(c("a","b"), c("g","h","i"))) And on the other hand I have a list Ind<-list("b","g") This holds, for each dimension, an indexer for that dimension. Now I would like to get...

Hi, anyone knows about any functions in R can get multidimensional integration not over a multidimensional rectangle (not adapt). For example, I tried the following function f(x,n)=x^n/n! phi.fun<-function(x,n) { if (n==1) { x }else{ integrate(phi.fun, lower=0, upper=x, n=n-1)$value } } I could get f(4,2)=4^2/2!=8, but failed in f(4,3)=4^3/3! Thanks B...

I am moving this to r-devel. The problem and solution below posted on r-help could have been a bit slicker if %*% worked with multidimensional arrays multiplying them so that if the first arg is a multidimensional array it is mulitplied along the last dimension (and first dimension for the second arg). Then one could have written: Tbar <- tarray %*% t(wt) / rep(wti, each = 9) which is a bit nicer than what had to be done, see below,...

Hello. I have a 4 dimensional array and I want to fill in the slots with values which are a function of the inputs. Through searching the forums here I found that the function "outer" is helpful for 2x2 matrices but cannot be applied to general multidimensional arrays. Is there anything which can achieve, more efficiently than the following code, the job I want? K <- array(0,dim=c(2,2,2,2)) #dimensions will be much larger for(x1 in 1:2) { for(y1 in 1:2) { for(x2 in 1:2) { for(y2 in 1:2) { K[x1,y1,x2,y2] <- x1*y2 - si...

...rgs, ...) : Additional argument not expected in the integrand function function change to my=function(x,g,i,j) result is not right. it should be 1, but it turns out to be 0.039... How can I make this work? Thank you! -- View this message in context: http://r.789695.n4.nabble.com/cuhre-usage-multidimensional-integration-tp3873478p3873478.html Sent from the R help mailing list archive at Nabble.com.

Consider the following data frame X <- data.frame(Titanic) Does anyone know of an easy way to convert X into a multidimensional array? Example that doesn't work X <- as.array(X, dim=c(4,2,2,2)) To do what I need, X needs to be converted into an array of dimensions c(4,2,2,2) in this case, not a table. Thanks in advance.

...is between 2 and 5. I would like to use splines to use this, I checked the mailing list and CRAN but couldn't find anything that would help me (Tps in fields is too slow, cobs would be really nice but seems to be one-dimensional). Is there any package that would at least give me the basis for multidimensional b-splines? Or even one that would do the fitting, perhaps even with constaints on derivatives at the edges (which I can specify from theory)? Thank you, Tamas -- Bayesian statistics is difficult in the sense that thinking is difficult. --Donald A. Berry, American Statistician 51:242 (1997)

Hi there, I'm trying to do a regression experiment on a multidimensional dataset where both x and y in the model are multidimensional vectors. I'm using R version 2.9.2, updated packages, on a Linux box. I've tried gausspr(), ksvm() and rvm(), and the models are computed fine, but I'm always getting the same error message when I try to use predict(): &quot...

Dear R list Would anyone be able to tell me whether it is possible to do "enhanced multidimensional scaling" (enhanced MDS) in R? In other words, something that goes beyond "cmdscale" by iteratively improving the fit between observed dissimilarities and inter-object distances, using the KYST algorithm (Kruskal, 1964). I have found several implementations of non-metric MDS in va...

Hi there I know, I'm sure you discussed this stuff 100 times, but I really have a basic understanding problem, if and how do I create a multidimensional array in R. I'm coming from MATLAB and there it's as easy as you ever could imagine. Ok, so, I want to have an array, where I can fill in data from a Excel spreadsheet. The array should be addressed like this: data["Cacao"]["Open"] or data["Cotton"][&quot...

...this information, but unfortunately is not very > robust. Carrying this information from the front-end into the IR is a > much more reliable way, especially if the source language already has > the semantics. Are you interested in the C family, or another language (e.g. fortran) that has multidimensional arrays as a first class concept? I can see how this is useful for the later case, but in the former case you’d just be changing where you do the pattern matching, right? >> That said, this is just my opinion - I have no data to back this up. Adding ‘experiemental’ intrinsics is cheap and...

Hi, I have a multidimensional data-set( multiple 'x' variables with a target variable). I want to take it to a higher dimensional space so that I can apply classification technique with ease . Is there a package in R which would allow me to take these data points from lower dimensional space to higher dimensions? so tha...

...15-05-2012 11:00, r-help-request at r-project.org escreveu: > Date: Mon, 14 May 2012 13:22:11 -0400 From: David Winsemius > <dwinsemius at comcast.net> To: math_daddy <math_daddy at hotmail.com> Cc: > r-help at r-project.org Subject: Re: [R] How to apply a function to a > multidimensional array based on its indices Message-ID: > <155F48F0-04C2-4033-A7BE-FC5109224DFA at comcast.net> Content-Type: > text/plain; charset=US-ASCII; format=flowed; delsp=yes On May 14, > 2012, at 10:09 AM, math_daddy wrote: >> > Hello. I have a 4 dimensional array and I want to...

Hi Does anyone know if there's a package I can use to do Multidimensional scaling ? Thank's EJ -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !)...

Hello! the function apply() allows to compute the row sum of a multidimensional table but, when I try to merge the new column with the original table whith cbind(), the grouping varibles disapear and the new table is bidimensional. Knows anybody how to add row totals to a multidimensional table? Thanks in advance Juan Pablo ______________________________________________...

...will probably ease the computational burden. HTH, Andy > -----Original Message----- > From: RenE J.V. Bertin [mailto:rjvbertin at despammed.com] > Sent: Thursday, February 27, 2003 3:42 PM > To: Wiener, Matthew > Cc: r-help at stat.math.ethz.ch > Subject: Re: [despammed] RE: [R] multidimensional function fitting > > > On Thu, 27 Feb 2003 13:52:50 -0500, "Wiener, Matthew" > <matthew_wiener at merck.com> wrote regarding > "[despammed] RE: [R] multidimensional function fitting" > > 8-) Take a look at package mgcv. Hope this helps. --Matt &g...

...and the predict.gam function, from C. See the R extensions manual. Reid Huntsinger -----Original Message----- From: RenE J.V. Bertin [mailto:rjvbertin at despammed.com] Sent: Thursday, February 27, 2003 3:42 PM To: Wiener, Matthew Cc: r-help at stat.math.ethz.ch Subject: Re: [despammed] RE: [R] multidimensional function fitting On Thu, 27 Feb 2003 13:52:50 -0500, "Wiener, Matthew" <matthew_wiener at merck.com> wrote regarding "[despammed] RE: [R] multidimensional function fitting" 8-) Take a look at package mgcv. Hope this helps. --Matt 8-) Thank you, I just did. It may in...

Hello, Is there a test for independence available based on a multidimensional contingency table? I've about 300 processes, and for each of them I get numbers for failures and successes. I've two or more conditions under which I test these processes. If I had just one process to test I could just perform a fisher or chisquare test on a 2x2 contigency table, like thi...

Hello, We are trying to find a function to compute "stress" in our multidimensional scaling analysis of a dissimilarity matrix. We've used "dist()" to create the matrix and "cmdscale()" for the scaling. In order to determine the number of dimensions we would like to plot stress vs. dimensions. However, we cannot find a pre-made command. It seems that other...