I am trying to have the x-axis labels to be split into two lines. I would also like the labels to be rotated 45 degrees. How can I do this? What I have so far: N <- 10 dnow <- data.frame(x=1:N, y=runif(N), labels=paste("This is observation ",1:N)) with(dnow, plot(x,y, xaxt="n", xlab="")) atn <- seq(1,N,3) axis(1, at=atn, labels=labels[...
I have a list of lm (linear model) objects. How can I select a particular element (such as the intercept, rank, or residuals) from all the objects in a single call? ...
I use R under Windows on several machines. I know you can set the working directory from within an R script, like this setwd("C:/Documents and Settings/username/My Documents/x/y/z") ... but then this breaks the portability of the script. It's also annoying to have to reverse all the slashes (since Windows gives you backslashes) Is th...
I have a quad-core laptop running Windows XP, but looking at Task Manager R only ever seems to use one processor at a time. How can I make R use all four processors and speed up my R programs? ...
What graphics devices let me use system fonts for text within charts? The base graphics system only has a small amount of documentation around the par(family=...) options. Ideally I'd like to be able to use any font I can browse through a tool like xfontsel on Linux or the equivalent utilities on other platforms. My current solution is...
Is there an easy way to read the value of the cells rather than the formula? By the way I only get this problem in a spreadsheet that I have published but not in spreadsheets that are private. So for instance in a cell whose value was created by simply using the value from the cell immediately to the left in the Google spreadsheet I woul...
I know that pdf("myOut.pdf") will print to a PDF in R. What if I want to Make a loop that prints subsequent graphs on new pages of a PDF file (appending to the end)? Make a loop that prints subsequent graphs to new PDF files (one graph per file)? ...
I want to subtract 1 day from a POSIX date and end up at the same time around DST. For example, when I add a day: > as.POSIXct('2009-03-08 23:00:00.000') + 86400 [1] "2009-03-09 23:00:00 EDT" But when I go past, it offsets: > as.POSIXct('2009-03-08 23:00:00.000') - 86400 [1] "2009-03-07 22:00:00 EST" What's the best way to deal ...
I would like to read a binary file -- of indeterminate length -- directly from a URL in R. Using readBin to read from a URL, without specifying the file size, does not work. anImage <- readBin('http://user2010.org/pics/useR-large.png','raw') Is there another approach that would allow this? ...
Are there any R-project packages that implement AOP? Or even better an example of an R package that uses any such AOP library. ...
How do I scrape html tables using the XML package? Take, for example, this wikipedia page on the Brazilian soccer team. I would like to read it in R and get the "list of all matches Brazil have played against FIFA recognised teams" table as a data.frame. How can I do this? ...
I have a plot() that I'm trying to make, but I do not want the x-values to be used as the axis labels...I want a different character vector that I want to use as labels, in the standard way: Use as many as will fit, drop the others, etc. What should I pass to plot() to make this happen? For example, consider d <- data.frame(x=1:5,y=10:...
Code written using lapply and friends is usually easier on the eyes and more Rish than loops. I love lapply just as much as the next guy, but how do I debug it when things go wrong? For example: > ## a list composed of numeric elements > x <- as.list(-2:2) > ## turn one of the elements into characters > x[[2]] <- "what?!?" > > ## usi...
In ggplot2, how could I change the color of coloring in scatter plot? ...
Are there any R-project packages that facilitate asynchronous network IO? I'm think here along the lines of Ruby's Eventmachine or Python's Twisted. If there are several such packages/libraries which is the best in terms of: - performance - features ...
I doubt this is the right place to ask the question, but I was wondering if there is a good place for an introduction to developing web apps in R. I know people are doing it and I know about where to find out about RApache and brew but any kind of walkthrough? Just checking before I start on my own. ...
These days I am extensively using R to scatter plots. Most of the plotting is concerned with image processing, Recently I was thinking of plotting the scatter plots over an image. For example, I want something like this, The background needs to be filled with my image. With a particular scale. And I should be able to draw points (co-or...
While I can change annotations with the generic plot command turning off axes and annotations and specifying them again using the axis command e.g. cars <- c(1, 3, 6, 4, 9) plot(cars, type="o", col="blue", ylim=range(0, cars), axes=FALSE, ann=FALSE) axis(1, at=1:5, lab=c("Mon","Tue","Wed","Thu","Fri")) I cant do it with time series o...
How to use gsub with more than 9 backreferences? I would expect the output in the example below to be "e, g, i, j, o". > test <- "abcdefghijklmnop" > gsub("(\\w)(\\w)(\\w)(\\w)(\\w)(\\w)(\\w)(\\w)(\\w)(\\w)(\\w)(\\w)(\\w)(\\w)(\\w)(\\w)", "\\5, \\7, \\9, \\10, \\15", test, perl = TRUE) [1] "e, g, i, a0, a5" ...
we have to fit about 2000 or odd time series every month, they have very idiosyncratic behavior in particular, some are arma/arima, some are ewma, some are arch/garch with or without seasonality and/or trend (only thing in common is the time series aspect). one can in theory build ensemble model with aic or bic criterion to choose the b...