search for: proxim

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Hello all, I've been pouring through the various spatial packages, but haven't come across the right thing yet. Given a set of points in 2-d space X, i'm trying to find the subset of points in Y proximate to each point in X. Furthermore, the proximity threshold of each point in X differs (X$threshold). I've constructed this myself already, but it's horrificly slow with a dataset of 40k+ points in one set, and a 700 in the other. A very inefficient example of what I'm looking for:...

Greetings R Users! I am posting to inquire about the proximity matrix in the randomForest R-package. I am having difficulty pushing very large data through the algorithm and it appears to hang on the building of the prox matrix. I have read on Dr. Breiman's website that in the original code a choice can be made between using an N x N matrix OR to incr...

...> The PCI root-complex node of IORT has an ATS attribute, which we can > > already use. However its scope is the root complex, not individual > > root ports like with DMAR. > > > > I'm not very familiar with NUMA, but it looks like we just need to > > specify a proximity domain in relation to the SRAT table, for each > > viommu? The SMMUv3 node in IORT has a 4-bytes "proximity domain" > > field for this. We can add the same to the VIOT virtio-iommu nodes > > later, since the structures are extensible. > > > I think there the...

Hi, I was reading an article recently about how google ranks results (among many other things of course) based on the proximity of the search terms in the source documents. In addition, the position of the search terms in the search query string itself is also taken into consideration when determining how important each term is. Does Xapian do something similar - at least for the first part? For example, if I search f...

Does anyone know where I might be able to download/purchase a database of US cities and their longitude/latitude coordinates? I''d like to provide a search option on a website that allows users to search by city but include cities in the surrounding area. Thanks, Carl Youngblood _______________________________________________ Rails mailing list

Lucene has a syntax "foo bar"~10 for finding foo within 10 words of bar. Does ferret support this feature? (the ~ is used for fuzzy queries) Does rdig? This could be a deal breaker for me ''cos I really need proximity searches -- Posted via http://www.ruby-forum.com/.

Hi, Can anyone tell me if the Motorola Q has its Bluetooth always on like the IPhone? I want to use the Motorola Q in a Proximity Detection setup like that described on nerdvittles.com. I know the Treo 650 does not work well since the display must be on for the bluetooth to be on and this eats power. Thanks Chuck Bunn

hello, I want to use randomForest to classify a matrix which is 331030?42,the last column is class signal.I use ? Memebers.rf<-randomForest(class~.,data=Memebers,proximity=TRUE,mtry=6,ntree=200) which told me" the error is matrix(0,n,n) set too elements" then I use: Memebers.rf<-randomForest(class~.,data=Memebers,importance=TRUE,proximity=TRUE) which told me"the error is na.fail.default(list(class = c(17L, 17L, 17L, 29L, 29L, 29L, : missing v...

...to which proportion mtry/nvariables it makes sense to increase mtry without "overtuning" RF. Let me tell my example: I have 106 spectra belonging to 4 classes, the number of variables is 172. I'm interested in finding information about variables (importance, split points etc.) and proximities. First I ran a forest with mtry =30 and ntree=2500. The result was an oob-estimate of overall error rate of zero, perfect classification. In order to explore my results, I calculated the average proximity between the classes. I got: > res op12 op13 op14...

...th a radial basis: exp(-gamma*|u-v|^2). You should be able to see a PNG of the resulting plot here: http://www.flickr.com/photos/60118409 at N00/91835679/ The problem is that that's not good enough. I want a better fit. I think I can get one, I just don't know how. There's a paper on Proximal SVMs that claims a better result. To the best of my knowledge, PSVMs should not outperform SVMs, they are merely faster to compute. You can find the paper (with the picture of their SVM) on citeseer: http://citeseer.ifi.unizh.ch/cachedpage/515368/5 @misc{ fung-proximal, author = "G. Fung a...

Hello, I am struggling to produce an MDS plot using the randomForest package with a moderately large data set. My data set has one categorical response variables, 7 predictor variables and just under 19000 observations. That means my proximity matrix is approximately 133000 by 133000 which is quite large. To train a random forest on this large a dataset I have to use my institutions high performance computer. Using this setup I was able to train a randomForest with the proximity argument set to TRUE. At this point I wanted to construc...

Good Day, I'm using the randomForest package to perform a classification. If I supply weights to the optional classwt argument are proximity values computed as a weighted average? I understand that the forest will possibly change as a function of the particular weights I supply. Thanks in advance. Mike Michael Fugate Los Alamos National Laboratory Mail Stop MS-F600, Los Alamos, NM 87545 (505) 667-0398

Hello there, How to get the proximity matrix of new data in party package? Thanks. Joseph [[alternative HTML version deleted]]

Hi all, Can some one tell me the difference between the following two formulas? 1. epiG.rf <-randomForest(gamma~.,data=data, na.action = na.fail,ntree = 300,xtest = NULL, ytest = NULL,replace = T, proximity =F) 2.epiG.rf <-randomForest(gamma~.,data=data, na.action = na.fail,ntree = 300,xtest = NULL, ytest = NULL,replace = T, proximity =F) [[alternative HTML version deleted]]

...t we have now. Note that in all likelyhood, support for older servers (including server 1.9) will be dropped in the next version. Hence the 2.6 branch will be maintained for a while. This release has some improved tablet handling, notably for tablets that send coordinates while still being out-of-proximity. Proximity support itself has been added to evdev as well, devices that support it will get DevicePresence events (note that proximity is not exposed as an axis for XI2, there are some design questions that need to be clarified first). The button mapping code was changed to support styli. Note...

<posted & mailed> Dear all, I'm trying to solve the problem, of how to find clusters of values in a vector that are closer than a given value. Illustrated this might look as follows: vector <- c(0,0.45,1,2,3,3.25,3.33,3.75,4.1,5,6,6.45,7,7.1,8) When using '0.5' as the proximity requirement, the following groups would result: 0,0.45 3,3.25,3.33,3.75,4.1 6,6.45 7,7.1 Jim Holtman proposed a very elegant solution in http://tolstoy.newcastle.edu.au/R/e2/help/07/07/21286.html, which I have modified and perused since he wrote it to me. The beauty of this approach is that it...

Hi, I'd like to know how we can choose the distance between two words that we search in a text. I know there is an "op_near" operator but I don't know how I can specified that the number of words between the two specified words should not exceed 10 or 20 or x words. I'm really sorry for my terrible English, I hope I'm understandable!

Are there any options to forming queries with Omega? For instance can you specify a proximity search like "file near 5 manager"? If so, where might I find this documented? I don't see it in the docs directory. Thanks Jim.

...tance and similarity matrices made it to CRAN, and will propagate to the mirrors soon. It includes an enhanced version of "dist()" with support for more than 40 popular similarity and distance measures, both for auto- and cross-distances. Some important ones are implemented in C. The proximity measures are stored in a registry which can easily be queried and extended by users at run-time. For adding a new measure, the simplest way is to provide the distance measure as a small R function, the package code will do the loops on the C code level to create the proximity matrix. It is o...