[R] using read.table, removing extra quotation mark from a text field? (e.g. cat )

I am using read.table to import a text file within R.   There are several errors in my text file.  An extra quotation mark has inadvertently been included within a few text fields.   e.g. for a pipe (|) delimited text file, I have something similar to this:   1|7|30| dog 2|6|25| cat 3|4|20|

[R] easiest way to write an R dataframe to excel?

I am using R 2.11.1 in a Microsoft Windows 7 environment.   I tried using WriteXLS, but get the message In system(cmd) : perl not found   What is the easiest way to write an R dataframe to Excel?  (I am familiar with WriteXLS, but I do not have PERL installed, and if not needed, do not wish to

[R] loading a package within R, in a MS Windows environment?

I am using R 2.11.1 in a Microsoft Windows environment. Is there a way to load a package (e.g. the zoo package) using only written code, not menus or mouse clicks? The code below code brings up the Select One [package] menu.  I just want to automatically load the zoo package.  local({pkg -

[R] variation of the aggregate function

Is there a more efficient/elegant way to obtain the result z below. a - c('pink','pink','blue','blue','gold','gold') b - c(5,8,9,12,7,4) agg - aggregate(x=b,by=list(a), FUN='mean') m - match(a, agg[,1]) z - agg[m,2] z [[alternative HTML version deleted]]