similar to: using get() in assign()

I am wondering if it is possible to read.table repeatedly from a list of file names into a new list of table names. For example: filenames <- list.files() then with a function like rf <- function(i) { word??(filename[i]) <- read.table(filenames[i]) } I can't seem to find a function like word?? that will be the object of another operation. If this worked, then I could repeat

Hello! I have a question about my lattice barchart that I am trying to build in Section 3 below. I can't figure out a couple of things: 1. When I look at the dataframe "test" that I am trying to plot, it looks right to me (the group "Total" is always the first out of 5). However, in the chart it is the last. Why? 2. How can I make sure the value labels (on y) are not

Hello, I'm having trouble discovering what's going wrong with my use of natural joins via sqldf. Following the instructions under 4i at http://code.google.com/p/sqldf/, which discusses creating indices to speed joins, I have been only unreliably able to get natural joins to work. For example, > Tid <- c('AES 01-01-02 10:58:00', 'AES 01-01-02 11:53:00', 'AES

there is my code,  expect return value  is a data frame but R say it is list: SEXP Julia_R_MD_NA_DataFrame(jl_value_t* Var) {  SEXP ans,names,rownames;  char evalcmd[4096];  int i;  const char* dfname="DataFrameName0tmp";  jl_set_global(jl_main_module, jl_symbol(dfname), (jl_value_t*)Var);  //Get Frame cols   sprintf(evalcmd,"size(%s,2)",dfname);  jl_value_t*

I'm using the levelplot function in the lattice package. I am plotting a grid of cells and I want grid lines drawn between cells. I've spent a lot of time trying different options. I've also looked at panel.levelplot. The border parameter seems to be ignored or it doesn't mean cell border color. The panel.levelplot calls grid.rect but forces lwd=1e-5 instead the passed lwd. On

Hello All, Hope people won't mind my posting a LaTeX question here. I know a lot of people who use R are also using LaTeX. I'm in a bit of a rush to complete a document and am having trouble with one aspect of the formatting. I'm creating a list of tables using: \listoftables I also have some table captions that contain the number of patients in an anlysis like: \caption{Results

Hello all, I have a data frame dataa: newdate newstate newid newbalance newaccounts 1 31DEC2001 AR 1 1170 61 2 31DEC2001 VA 2 4565 54 3 31DEC2001 WA 3 2726 35 4 31DEC2001 AR 3 2700 35 The following gives me the balance of state AR:

With apologies if I missed the answer in the response given to my previous question. How do I extract the name of an object and assign it to a string variable? For example, I have a dataframe named comnoglyc How do I assign this name to a variable dfname such that print(dfname) returns "comnoglyc"? Thank you very much. Payam [[alternative HTML version deleted]]

(R 1.9.1; Windows 2000;) I'm just comparing ease of use, speed, etc for methods of transferring data frames in the Excel, MySQL, R triangle. It turns out that going from Excel to R (when doing this carefully). Using the clipboard is actually quite fast and efficient (2 seconds for transferring 120 000 cells on a common desktop computer as compared to much longer for going the RODBC route,

Hi, I would like to extract the last row of each group in a data frame. The data frame is as follows Name Value A 1 A 2 A 3 B 4 B 8 C 2 D 3 I would like to get a data frame as Name Value A 3 B 8 C 2 D 3 Thank you for your suggestions in advance Jeff

All, I have a workspace containing only data frame objects. I would like to loop though each one and clean-up text columns in them. How can I have R loop through the list? I have tried to find an answer in R help but the closest solution I can find is to make a static list of data frames, as illustrated in this recent post: ---------begin post On Tuesday 19 February 2008 (19:51:15), TLowe wrote:

How can i plot an array and instead of having on the x labels the indexes of the array I want to display an other String array of the same length

Hello, I have a data frame with many rows, and I want to create a column with a name only at every 12th row, starting from 97 to 278. Thanks in advance!

Dear R users, I've just posted a similar question about Illustrator. This time I would like to export the results of my statistic tables and my dataframes into Excel files. Up to now I've used write.csv(), but I have to resave every file in .xls in Excel. I would like to know if there is a function or package to export directly into *.xls. I have found xlsReadWrite which would be

Dear all: Does anybody know about label conflicts between xtable and Hmisc? I found a couple of e-mails similar to this problem but is not clear to me how to get around the label problem. The first table(longtable below) is generated with the latex function from Hmisc but for some reason when I try to hyperlink to it,it takes me to the top of the document. The second table created with the xtable

I'm a new R user so this is possibly a naive question. I'm trying to load an external CSV file into a dataframe using: df_name<-read.table("myfile.csv") myfile.csv should have 5 elements per row, though a percentage are missing the last two elements (the commas are present as placemarkers). However, R does not create the dataset but returns the message: line 1

Hi. I'm a new R user and think what I'm trying to do is pretty basic, but haven't been able to find the answer in the mailing list archives. How do I write a function that creates new variables in a given data.frame with a prefix attached to the variable names? I do a lot of repetitive logging and scaling of variables, and would like a way to consistently generate and name versions

I have a file that reads like this: Species,Year,Julian_day Alnus_glutinosa, 1873, 123 Sorbus_aucuparia, 1873, 122 ....(more species...) Alnus_glutinosa, 1874, 134 Sorbus_aucuparia, 1874, 143 ....(more species and years) Is there a way to plot this as julian day over years so that each species get a different color? Also is it possible to convert this data into the format: Alnus_glutinosa,

I have a list of txt files that I want to convert into .rdata R data object. filenames 1. "./file1.txt" 2. "./file2.txt" 3. "./file3.txt" 4. "./file4.txt" 5. "./file5.txt" 6. "./file6.txt" 7. "./file7.txt" 8. "./file8.txt" 9. "./file9.txt" 10. "./file10.txt" I saved these files as for ( i in

Often it is useful to keep a "codebook" to document the contents of a dataset. (By "dataset" I mean a rectangular structure such as a dataframe.) The codebook has as many rows as the dataset has columns (variables, fields). The columns (fields) of the codebook may include: ? variable name ? type (character, factor, integer, etc) ? variable label