Search Archives

I'm wondering if the speed of accessing list element by index is the same as that of accessing list element by name. l[[1]] l[['name']]

Hi, Suppose that I have a csv file that is compressed with zip, is there a way to read it in R without first decompressing it to a file. Regards, Peng

I don't find where in the R document the discussion of nested namespace is. If there is nested namespace supported in R, could somebody let me know whether the document is?

I want to see some working examples on how to call C++ programs from R. Could somebody let me know which R packages mainly use C++ rather than C or Fortran?

An embedded and charset-unspecified text was scrubbed... Name: not available URL: <https://stat.ethz.ch/pipermail/r-help/attachments/20090828/bc44b417/attachment-0001.pl>

Is there a way to profile an R program similar to valgrind (valgrind.org), in the sense that I can easily see which function is the bottleneck of an R program?

Chambers' book Statistical Models in S mentioned 'column.prods()'. But I don't find it in R. I'm wondering if there is an equivalent in R?

For any given package (for example, data.table), is there a way to show all the available vignette from the package (or to know whether there is vignette)?

An embedded and charset-unspecified text was scrubbed... Name: not available URL: <https://stat.ethz.ch/pipermail/r-help/attachments/20091217/4d76a808/attachment-0001.pl>

I only want to load a limited number of rows by dbReadTable(). I don't see an option in the help. Is there an option to do so?

'.Diag' and '.asSparse' are defined in contrast.R. I'm wondering why I don't see them in my R session. Is it because that they start with '.'?

Hi, I don't see what the difference between read.delim and read.delim2 after reading the help. Can somebody let me know what it is? Regards, Peng

Hi, > match(c(3,4), c(3,2,1)) [1] 1 NA The above result has 'NA' in. Is there a way to make 'match' does not produce any 'NA's? Regards, Peng

Hi, According to my understand of the description in R-intro, double quote and single quote are the same. Can somebody confirm if this is the case? Regards, Peng

There are different way to make R classes. I know R.oo and S4. I'm wondering which one is the current popular one. Which one is current recommended when make new R packages? Thank you!

'?removeClass' shows that 'removeClass' is from package 'package:methods'. Is there a command which can show me all the functions and the classed defined in a package such as 'package:methods'?

Hi, Suppose that there are multiple files in a .gz file. How to open only one file in it? I don't find such options in the help. Regards, Peng

There are several '?'s on the last page of the following document. Apparently, they are not correct. Could somebody correct it? cran.r-project.org/doc/contrib/Genolini-S4tutorialV0-5en.pdf

> paste(c('a','b'),sep='') [1] "a" "b" The above command doesn't concatenate the strings in a single string. I'm wondering what is the correct way to do so.

Hi, tempdir() always gives me the same result. Should it give a different result each time I call it? > tempdir() [1] "/tmp/RtmppB72wH" > tempdir() [1] "/tmp/RtmppB72wH" Regards, Peng