read.transactions {arules} | R Documentation |
Reads a transaction data file from disk and creates a
transactions
object.
read.transactions(file, format = c("basket", "single"), sep = NULL, cols = NULL, rm.duplicates = FALSE, encoding = "unknown")
file |
the file name. |
format |
a character string indicating the format of the data
set. One of |
sep |
a character string specifying how fields are separated in
the data file, or |
cols |
For the ‘single’ format, |
rm.duplicates |
a logical value specifying if duplicate items should be removed from the transactions. |
encoding |
character string indicating the encoding which is passed to
|
For ‘basket’ format, each line in the transaction data file
represents a transaction where the items (item labels) are separated
by the characters specified by sep
. For ‘single’
format, each line corresponds to a single item, containing at least
ids for the transaction and the item.
Returns an object of class
transactions
.
## create a demo file using basket format for the example data <- paste("item1,item2","item1","item2,item3", sep="\n") cat(data) write(data, file = "demo_basket") ## read demo data tr <- read.transactions("demo_basket", format = "basket", sep=",") inspect(tr) ## create a demo file using single format for the example ## column 1 contains the transaction ID and column 2 contains one item data <- paste("trans1 item1", "trans2 item1","trans2 item2", sep ="\n") cat(data) write(data, file = "demo_single") ## read demo data tr <- read.transactions("demo_single", format = "single", cols = c(1,2)) inspect(tr) ## tidy up unlink("demo_basket") unlink("demo_single")