R help - Feb 2012 - how do I exort a list of numbers into csv file?

Hi all,

I have a list of vector of numbers - the reason I used list of vector was
that I each list have different numbers of numbers which I don't know
before run-time.

mylist[[1]]  = c(1, 2, 3)
mylist[[2]] = c (3, 4, 5, 6)
...
...
etc.

Could you please tell me if there is a way to dump all these at once into
csv file such that each row correspond to a vector or a cell of the list as
shown above?

Thanks a lot!

	[[alternative HTML version deleted]]

Hi Michael,

Part of me imagines this is overkill, but this should be one option:

## your data
mylist <- list(1:3, 3:6)
## open a writeable connection to a file
con <- file("test.csv", "w")
## first collapse each element of the list to be a comma separated
string, then write each
## element of new character vector to con using writeLines
writeLines(sapply(mylist, paste, collapse = ", "), con = con)
## close the connection
close(con)

see ?writeLines for details on different ways to indicate end of the line.

Hope this helps,

Josh

On Sun, Feb 5, 2012 at 6:01 PM, Michael <comtech.usa at gmail.com>
wrote:
> Hi all,
>
> I have a list of vector of numbers - the reason I used list of vector was
> that I each list have different numbers of numbers which I don't know
> before run-time.
>
> mylist[[1]] ?= c(1, 2, 3)
> mylist[[2]] = c (3, 4, 5, 6)
> ...
> ...
> etc.
>
> Could you please tell me if there is a way to dump all these at once into
> csv file such that each row correspond to a vector or a cell of the list as
> shown above?
>
> Thanks a lot!
>
> ? ? ? ?[[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.


-- 
Joshua Wiley
Ph.D. Student, Health Psychology
Programmer Analyst II, Statistical Consulting Group
University of California, Los Angeles
https://joshuawiley.com/

Hi,

If you don't mind having NAs for missing values, try the following,

mylist = list(1:3, 4:7)
library(plyr)
write.csv(do.call(rbind.fill.matrix, lapply(mylist, matrix, nrow=1)),
file="")

HTH,

b.

On 6 February 2012 15:01, Michael <comtech.usa at gmail.com>
wrote:
> Hi all,
>
> I have a list of vector of numbers - the reason I used list of vector was
> that I each list have different numbers of numbers which I don't know
> before run-time.
>
> mylist[[1]] ?= c(1, 2, 3)
> mylist[[2]] = c (3, 4, 5, 6)
> ...
> ...
> etc.
>
> Could you please tell me if there is a way to dump all these at once into
> csv file such that each row correspond to a vector or a cell of the list as
> shown above?
>
> Thanks a lot!
>
> ? ? ? ?[[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.