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Hi all, I frequently encounter datasets that require me to repeat the same calculation across many variables. For example, given a dataset with total employment variables and manufacturing employment variables for the years 1990-2010, I might have to calculate manufacturing's share of total employment in each year. I find it cumbersome to have to manually define a share for each year and

I need to import a large number of simple, space-delimited text files with a few columns of data each. The one quirk is that some rows are missing data and some contain junk text at the end of each line. A typical file might look like: a b c d 1 2 3 x 4 5 6 7 8 9 x 1 2 3 x c c 4 5 6 x 7 8 9 x I'm trying to avoid having to pre-process the text files, as they all sit on an ftp site that I

Hi All: I have some basic questions about Cairo graphics engine. I'm trying to use the Cairo package to produce PDF output, mainly because I perceive it to be easy to use with a wide variety of fonts. But right now, I'm stuck trying to figure out what fonts are available to be used with Cairo, specifically the CairoPDF function. I've been able to successfully produce some test PDFs

Hi All: I'm looking to find out a bit more about how subassignment actually works and am hoping someone with knowledge of the details can fill me in (I've looked at the source code, but my knowledge of C is lacking). In the case of vectors, my reading of ?"[" would indicate that for a vector, vec <- 1:25, vec[c(1,5,25)] <- c(101,102,103)is functionally the same as

I have a data set covering a large number of cities with values for characteristics such as land area, population, and employment. The problem I have is that some cities lack observations for some of the characteristics and I'd like a quick way to determine which cities have missing data. For example:

Hi all, I'm a new R user and am confused about how R behaves when converting a vector to a data frame when using the data.frame function. I'm specifically interested in cases where the vector is expressed as a subset of another data frame. For example, say I want to create a data frame from the last three rows of the third column of the data frame, d, that I've created below:

I'd like to summarize several variables in a data frame, for multiple groups, and store the results in a data.frame. To do so, I'm using by(). For example: df<-data.frame(a=1:10,b=11:20,c=21:30,grp1=c("x","y"),grp2=c("x","y"),grp3=c("x","y")) dfsum<-by(df[c("a","b","c")],

I'm wondering about the behavior of the merge function when using factors as by variables. I know that when you combine two factors using c() the results can be odd, as in: c(factor(1:5),factor(6:10)) which prints: [1] 1 2 3 4 5 1 2 3 4 5 I presume this is because factors are actually stored as integers, with 6,7,8,9,10 stored internally as 1,2,3,4,5. This concerns me somewhat, as I often

I have to create a number of bubble plots, and am wondering what methods folks prefer for this task. I've been experimenting with the symbols() function, with text() to provide plot labels. Any opinions on the relative merits of this method versus others? One criterion would be the ability to fine-tune the placement of text labels. I would like to use lattice, but haven't found a way to

I'm wondering how the cex parameter is used to scale circles (i.e. does it scale the radius, diameter, area, circumference, etc.?). In my case I'm using lattice with filled circles (pch=19). Based on example, it looks like R scales the radius of the circle: library(lattice) dta<-data.frame(x=rep(1,6),y=rep(1,6),sz=c(1,2,4,8,16,32))

Hi all: I've been trying to figure out a way to move the tick mark labels in my lattice plots closer to the the axes. I've tinkered with a lot of the "buffer" parameters (those listed by trellis.par.get()), but haven't had any luck. Any ideas? Cheers. [[alternative HTML version deleted]]

Hi all: I'm using grid to create a layout in R that will include text mixed with graphics. In the layout, the positions of certain graphical elements depend on the number of lines in adjacent text blocks (which will vary from case to case). I was hoping to use grid's built in functions to automate the placement of the graphical elements. I can get this to work if I use the standard pdf

Hi All: I've been struggling for a while trying to get grImport up and running. I'm on a Windows 7 (home premium 64 bit) machine running R-2.12.2 along with GPL Ghostscript 9.01. I've set my Windows PATH variable to point to the Ghostscript \bin and \lib directories, and I've created the R_GSCMD environment variable pointing to gswin32c.exe. I don't have any experience with