search for: shenkin

...osed, etc ... col_classes = read.csv("column_classes") new_myframe = read.csv("myfile.csv", colClasses = col_classes) My question is how to construct the "get_col_classes()" function above. Any thoughts are greatly appreciated! Thanks, Allie -- Alexander Shenkin PhD Candidate School of Natural Resources and Environment University of Florida http://snre.ufl.edu/people/students.asp

...haps crossdist() in spatstat is what I should use, and then code a comparison with X$threshold after the cross-distances are computed. However, I was wondering if there was another tool I should be considering. Any and all thoughts are very welcome. Thanks in advance. Thanks, Allie -- Alexander Shenkin PhD Candidate School of Natural Resources and Environment University of Florida http://snre.ufl.edu/people/students.asp

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

> 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

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

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

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,

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

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

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

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

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

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),

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

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

On 02/12/2017 5:48 AM, Alexander Shenkin wrote: > 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 my...

Hi Folks, I'm surprised, but I didn't find this question addressed anywhere. I'd like to generate a LaTeX caption with R code. I've tried the code below, but I get the following TeX error: ! Argument of \@caption has an extra }. <inserted text> \par l.21 } Any thoughts? Perhaps I'll have to write the "\caption{}" text with R? thanks!

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

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!

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.