ffbase (version 0.13.3)

ffbase-package: Basic statistical functions for ff

Description

Basic statistical functions for ff vectors and ffdf data.frames. The aim of ffbase is to make working with ff vectors and ffdf data.frame a bit easier.

Basic operations

cut.ff	cut a ff vector.
c.ff	concatenate ff vectors.
unique	unique for a ff vector and ffdf.
duplicated	duplicated for a ff vector and ffdf.
ffmatch	match for a 2 ff vectors.
ffdfmatch	match for 2 ffdf objects.
%in%	%in% operator for a ff vector and ffdf.
is.na.ff	is.na for a ff vector.
+, -, *, /, ^, %%, %/%	operators for arithmetic on ff vector.
==, !=, <, <=, >=, >, &, |, !	compare & logic operators for working with ff vectors.
abs, sign, sqrt, ceiling, floor, trunc, round, signif	Math operators for working on ff vectors.
log, log10, log2, log1p, exp, expm1	Math operators for working on ff vectors.
acos, acosh, asin, asinh, atan, atanh	Math operators for working on ff vectors.
cos, cosh, sin, sinh, tan, tanh	Math operators for working on ff vectors.
gamma, lgamma, digamma, trigamma	Math operators for working on ff vectors.

Selections

subset.ffdf	subset a ffdf.
transform.ffdf	create a new ffdf based on an existing ffdf
with.ffdf	create a ff vector based on columns of an existing ffdf
within.ffdf	create a ffdf data.frame based on columns of an existing ffdf
ffwhich	create a ff integer vector based on a logical expression

Aggregations

hist.ff	Calculate a histogram for ff vector.
quantile.ff	Get quantiles for ff vector.
sum.ff	sum for a ff vector.
mean.ff	(trimmed) mean for a ff vector.
all.ff	all for logical ff vector.
min.ff	min for ff vector.
max.ff	max for ff vector.
cumsum.ff	cumsum for ff vector.
cumprod.ff	cumprod for ff vector.
range.ff	range for ff vector.
table	table for ff vectors.
tabulate.ff	tabulate for ff vectors.
ffdfdply	Split, group and aggregate for ffdf operations.

Miscellaneous

ffordered	Add a sorted index to a ff vector.
save.ffdf	Save a ffdf in a directory with its containing ff columns.
load.ffdf	Loads a ffdf from a directory
pack.ffdf	Packs ffdf data.frames into a zip or tar file
unpack.ffdf	Unpacksdata.frames from a zip or tar file
ffappend	Append data to a ff vector.
ffdfappend	Append data to a ffdf.
merge.ffdf	Merge two ffdf objects.
ffmatch	match two ff vectors
ffdfmatch	match two ffdf data.frames
laf_to_ffdf	Import csv and fixed width files through package LaF.

Examples

# NOT RUN {
ffdat <- as.ffdf(data.frame(x=1:10, y=10:1))

# add a new ff vector z to the ffdf data.frame
within(ffdat, {z <- x+y})[]

# add a new ff vector z to the ffdf data.frame using transform
transform(ffdat, z=x+y)[]

cut(ffdat$x, breaks=3)[]

tabulate.ff(ffdat$x)
# }