[R] Append/merge

[Mark Myatt]

Debra Taylor <debrat at bestweb.net> writes:
>    I have a question about stacking datasets. 
>
>    I have 40 stata datasets that have exactly the same number of 
>    variables, with the same names (~420k rows, 8 columns). 
>
>    The datasets are relatively large ~ 15 megs. 
>
>    If they were text files a linux "cat file1 file2 >> combo" sort of 
>    strategy would work. 

[Snip]

>    Does somebody have an R solution in mind? 

Read each data file in as a data frame then use the rbind() function.
Something like:

        a <- read.table("file1", header = T)
        b <- read.table("file2", header = T)
        my.data <- rbind(a, b)
        #
        # remove the excess 15MB ...
        #
        rm(b)
        a <- read.table("file3", header = T)
        my.data <- rbind(ab, a)
        #
        # and so on ... finally removing the excess 15MB ...
        #
        rm(a)

Mark


--
Mark Myatt


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