similar to: finding euclidean proximate points in two datasets

Displaying 20 results from an estimated 500 matches similar to: "finding euclidean proximate points in two datasets"

2010 May 19
1
export dataframe's column classes to a list
Hi Folks, I want to export a dataframe's column classes to a list so that I can reinstantiate the dataframe from a CSV file in the future. (I know about save(), which I'm using in addition to this). what I want to do is the following: write.csv(myframe); col_classes = get_col_classes(myframe); write.csv(col_classes, "column_classes") ... time passes, R gets
2010 Nov 17
3
translate vector of numbers to indicies of 0/1 matrix
Hello All, Searched around, haven't found a decent solution. I'd like to translate a vector of numbers to a matrix (or to a list of vectors) such that the vector values would serve as indicies of the 1's in an otherwise-zero-filled matrix (or list of vectors). For example: > a = c(1,3,3,4) # perform operation [,1] [,2] [,3] [,4] [1,] 1 0 0 0 [2,] 0 0 1
2011 Jun 05
3
reproduction archives
Hello Folks, As some of my old code broke when an updated package changed its interface, I started thinking about reproduction of analyses. It's not good enough to save our code - we have to save the package versions those analyses used as well as the R-core. I saw a couple references to "reproduction archives" around, but nothing specific. Is there any good way to package up
2012 Nov 07
3
extract indep vars from formula
Hello, I'm trying to extract the independent variables from a formula. The closest I've been able to come, aside from rolling my own, is the following: > a = y ~ b * x > attr(terms(formula(a)),"variables") The reason I'm doing this is that I'm building a grid of points that I use to construct a 3-d model prediction surface in rgl. If there are more than two
2011 Jun 22
2
strange date problem - May 3, 1992 is NA
> is.na(strptime("5/2/1992", format="%m/%d/%Y")) [1] FALSE > is.na(strptime("5/3/1992", format="%m/%d/%Y")) [1] TRUE Any idea what's going on with this? Running strptime against all dates from around 1946, only 5/3/1992 was converted as "NA". Even stranger, it still seems to have a value associated with it (even though is.na thinks
2012 Apr 02
2
summaryBy: transformed variable on RHS of formula?
Hi Folks, I'm trying to cut my data inside the summaryBy function. Perhaps formulas don't work that way? I'd like to avoid adding another column if possible, but if I have to, I have to. Any ideas? Thanks, Allie require(doBy) df = dataframe(a <- rnorm(100), b <-rnorm(100)) summaryBy(a ~ cut(b,c(-100,-1,1,100)), data=df) # preferred solution, but it throws an
2012 Nov 02
2
backreferences in gregexpr
Hi Folks, I'm trying to extract just the backreferences from a regex. > temp = "abcd1234abcd1234" > regmatches(temp, gregexpr("(?:abcd)(1234)", temp)) [[1]] [1] "abcd1234" "abcd1234" What I would like is: [1] "1234" "1234" Note: I know I can just match 1234 here, but the actual example is complicated enough that I have to
2012 Mar 07
2
dot products
Hello, I need to take a dot product of each row of a dataframe and a vector. The number of columns will be dynamic. The way I've been doing it so far is contorted. Is there a better way? dotproduct <- function(dataf, v2) { apply(t(t(as.matrix(a)) * v2),1,sum) #contorted! } df = data.frame(a=c(1,2,3),b=c(4,5,6)) vec = c(4,5) dotproduct(df, vec) thanks,
2012 Aug 07
3
r-forge down?
Hi Folks, I've looked around, haven't found anything, and I'm not sure where else to check. I haven't visited R-forge (http://r-forge.r-project.org) in a long time. Now that I'm trying, it seems to be down. Anyone know if this is a temporary condition, and if so, when it's expected to rise again? Thanks, Allie
2009 Aug 21
2
Convert list to data frame while controlling column types
Hello all, I have a list which I'd like to convert to a data frame, while maintaining control of the columns' data types (akin to the colClasses argument in read.table). My numeric columns, for example, are getting converted to factors by as.data.frame. Is there a way to do this, or will I have to do as I am doing right now: allow as.data.frame to coerce column-types as it sees fit, and
2012 Oct 18
3
bigmemory for dataframes?
Hi Folks, I've been bumping my head against the 4GB limit for 32-bit R. I can't go to 64-bit R due to package compatibility issues (ROBDC - possible but painful, xlsReadWrite - not possible, and others). I have a number of big dataframes whose columns all sorts of data types - factor, character, integer, etc. I run and save models that keep copies of the modeled data inside the model
2009 Aug 12
2
Symbolic references - passing variable names into functions
Hello All, I am trying to write a function which would operate on columns of a dataframe specified in parameters passed to that function. f = function(dataf, col1 = "column1", col2 = "column2") { dataf$col1 = dataf$col2 # just as an example } The above, of course, does not work as intended. In some languages one can force evaluation of a variable, and then
2012 May 21
2
sweave tables as images?
Hello folks, I've been on a journey trying to figure out how to manage documents that are amenable to sharing and editing, but that contain dynamic content generated by R. I've come to the following solution: I use Sweave to generate labeled png & pdf figures, and I "Insert & Link" those figures as "Pictures" in a Word 2010 doc. Thus, when data or code
2013 Mar 20
3
summarize dataframe based on multiple cols, not their combinations
Hi folks, I'm trying to figure out how to get summarized data based on multiple columns. However, instead of giving summaries for every combination of categorical columns, I want it for each value of each categorical column regardless of the other columns. I could do this with three different commands, but i'm wondering if there's a more elegant way that I'm missing. Thanks!
2012 Apr 07
3
How do Sweave users collaborate with Word users?
Hello All, I'm getting my workflow switched over to Sweave, which is very cool. However, I collaborate with folks (as many of you must as well) who use Word to Track Changes amongst a group while crafting a paper. In the simplest case, there will just be two people (one Sweave user and one Word user) editing a paper. I'm wondering, how do Sweave users go about this? I could convert a
2012 Feb 07
2
Vectorizing a loop
Hello Folks, I'm trying to vectorize a loop that processes rows of a dataframe. It involves lots of conditionals, such as "If column 10 == 3, and if column 3 is True, and both column 5 and 6 are False, then set column 4 to True". So, for example, any ideas about vectorizing the following? df = data.frame( list(a=c(1,2,3,4),
2012 Apr 04
3
Rgui maintains open file handles after Sweave error
Hello Folks, When I run the document below through sweave, rgui.exe/rsession.exe leaves a file handle open to the sweave-001.pdf graphic (as verified by process explorer). Pdflatex.exe then crashes (with a Permission Denied error) because the graphic file is locked. This only seems to happen when there is an error in the sweave document. When there are no errors, no file handles are left open.
2008 Nov 29
1
2D density tophat
Hello R users, I have successfully created a square (or more generally, rectangular) tophat smoothing routine based on altering the already available KDE2D. I would be keen to implement a circular tophat routine also, however this appears to be much more difficult to write efficiently (I have a routine, but it's very slow). I tried to create one based on using crossdist to create a distance
2017 Dec 02
2
source files in temp environment
Hi all, I often keep code in separate files for organizational purposes, and source() that code from higher level scripts. One problem is that those sourced files often create temporary variables that I don't want to keep around. I could clean up after myself with lots of rm()'s, but that's a pain, and is messy. I'm wondering if one solution might be to source the code in a
2013 Apr 02
2
exporting tables to word
Hello all, What is your preferred method to export tables (from ftable()) to Word? Do you just export to a text file and then copy/paste? Or perhaps via HTML output? Thanks, Allie