write | R Documentation |
Provides the generic function write()
and the methods to write
transactions or associations 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. |
... |
further arguments passed on to |
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? |
For associations (rules and itemsets) write()
first uses coercion to
data.frame to obtain a printable form of x
and then uses
utils::write.table()
to write the data to disk. This is just a method to
export the rules in human-readable form. These exported associations cannot be
read back in as rules. 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 requires package pmml.
Transactions can be saved in basket (one line per transaction) or in single (one line per item) format.
Michael Hahsler
Other import/export:
DATAFRAME()
,
LIST()
,
pmml
,
read
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 up
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