Write Transactions or Associations to a File
Provides the generic function write and the S4 methods to
write transactions or associations (itemsets, rules) to a file.
write(x, file = "",...)
## S4 method for signature 'transactions'
write(x, file="", format = c("basket", "single"),
sep=" ", quote=TRUE, ...)
## S4 method for signature 'associations'
write(x, file="", sep=" ", quote=TRUE, ...)x |
the transactions or associations (rules, itemsets, etc.) object. |
file |
either a character string naming a file or a connection open for writing. '""' indicates output to the console. |
format |
format to write transactions. |
sep |
the field separator string. Values within each row of x
are separated by this string. Use |
quote |
a logical value. Quote fields? |
... |
further arguments passed on to |
For associations (rules and itemsets) write first uses coercion
to data.frame to obtain a printable form of
x and then uses write.table to write the data to disk.
Transactions can be saved in basket (one line per transaction) or in single (one line per item) format.
Note: To save and load associations in compact form, use save and
load from the base package. Alternatively, association can be
written to disk in PMML (Predictive Model Markup Language)
via write.PMML. This requiresvpackages pmml.
Michael Hahsler
read.transactions for reading transactions from a file,
read.PMML and write.PMML
for reading/writing associations in PMML format,
write.table (in base),
transactions-class,
associations-class
data("Epub")
## write the formated transactions to screen (basket format)
write(head(Epub))
## write the formated transactions to screen (single format)
write(head(Epub), format="single")
## write the formated result to file in CSV format
write(Epub, file = "data.csv", format="single", sep = ",")
## write rules in CSV format
rules <- apriori(Epub, parameter=list(support=0.0005, conf=0.8))
write(rules, file = "data.csv", sep = ",")
unlink("data.csv") # tidy upPlease choose more modern alternatives, such as Google Chrome or Mozilla Firefox.