# ffbase v0.12.8

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## Basic Statistical Functions for Package 'ff'

Extends the out of memory vectors of 'ff' with
statistical functions and other utilities to ease their usage.

## Functions in ffbase

Name | Description | |

as.character.ff | Character Vectors | |

binned_sum | Fast summing in different bins | |

as.ffdf.ffdf | Trivial implementation, but very handy | |

bigglm.ffdf | Bounded memory linear regression | |

all.ff | Summary methods for ff objects | |

as.ram.ffdf | As ram for an ffdf to get your ffdf as a data frame in RAM | |

binned_sumsq | Fast squared summing in different bins | |

as.Date.ff_vector | Date Conversion Functions for ff vector | |

chunkify | Chunkify an element-wise function | |

byMean | Fast conditional mean | |

condMean | Fast conditional mean | |

bySum | Fast conditional sum | |

diff.ff | Lagged Differences | |

droplevels.ff | The function droplevels is used to drop unused levels from a ff factor or , more commonly, from factors in a ffdf | |

c.ff | Concatenate ff vectors | |

duplicated.ff | Duplicated for ff and ffdf objects | |

condSum | Fast conditional sum | |

droplevels.ffdf | The function droplevels is used to drop unused levels from factors in a ffdf | |

compact | Compact a ff vector or ffdf data frame | |

[.ff | Reading and writing vectors extended to handle logical ff vectors as indexes | |

chunkexpr | Chunk an expression | |

[.ffdf | Reading and writing data.frames (ffdf) | |

abs.ff_vector | Math for ff vectors | |

any.ff | Summary methods for ff objects | |

ffdfrbind.fill | rbind for ffdf where missing columns are added if not available in one of the ffdf objects | |

ffdfwith | Evaluate an expression in a ffdf data environment | |

>.ff_vector | Ops for ff vectors | |

ffwhich | Create an index from a filter statement | |

ffseq_len | Sequence Generation of ff vectors. | |

quantile.ff | quantiles | |

table | Cross Tabulation and Table Creation | |

tabulate.ff | Tabulation for ff vectors | |

rle_ff | Compute the lengths and values of runs of equal values in a vector | |

min.ff | Minimum, maximum and range of ff vector | |

ffseq | Sequence Generation of ff vectors. | |

move.ffdf | Moves all the columns of ffdf data.frames into a directory | |

ffrep.int | Replicate Elements of ff vectors. | |

ffdfappend | Append a dataframe or an ffdf to another ffdf | |

transform.ffdf | Transform a ffdf data.frame | |

ffdfdply | Performs a split-apply-combine on an ffdf | |

unique.ff | Unique values for ff and ffdf objects | |

ikey | Creates a unique integer key for unique combinations of rows of an ffdf | |

ffappend | Append a ff vector to another ff vector | |

within.ffdf | Evaluate an expression in a ffdf data environment | |

cut.ff | Convert Numeric ff vector to factor ff | |

ffifelse | Conditional Element Selection for ff vectors. | |

cumsum.ff | Cumulative Sums, Products, and Extremes | |

expand.ffgrid | Create a ffdf from All Combinations of Factors | |

+.ff_vector | Arithmetic Operators for ff vectors | |

is.na.ff | 'Not Available' / Missing Values for ff vectors | |

ffmatch | Value Matching for ff objects | |

mean.ff | Mean of ff vector | |

ffbase-package | Basic statistical functions for ff | |

with.ffdf | Evaluate an expression in a ffdf data environment | |

unpack.ffdf | Unpacks previously stored ffdf data.frame into a directory | |

merge.ffdf | Merge two ffdf by common columns, or do other versions of database join operations. | |

addfforder | Add the order of a ff vector of the ff vector x | |

ffrandom | Generate ff vector with draws from distribution | |

hist.ff | hist for ff vectors | |

subset.ff | Subsetting a ff vector or ffdfdata frame | |

pack.ffdf | Packs ffdf data.frames into a compressed file | |

hist2d.ff | compute and plot 2 dimensional histogram of ff data | |

ffdfsave | Save a ffdf data.frame in directory | |

format.ff_vector | Date Conversion Functions for ff vector | |

sum.ff | Sum of ff vector Elements | |

load.ffdf | Loads ffdf data.frames from a directory | |

grouprunningcumsum | Groups the input integer vector into several groups if the running cumulative sum increases a certain maximum number | |

laf_to_ffdf | Use LaF to import data into ffdf data.frame | |

save.ffdf | Save ffdf data.frames in a directory | |

set_ffbase_logging | sets the logging of ffbase | |

binned_tabulate | Fast tabulating in different bins | |

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## Details

License | GPL-3 |

Type | Package |

LazyLoad | yes |

URL | http://github.com/edwindj/ffbase |

RoxygenNote | 7.0.2 |

Encoding | UTF-8 |

NeedsCompilation | yes |

Packaged | 2020-03-08 13:33:09 UTC; edwindj |

Repository | CRAN |

Date/Publication | 2020-03-18 09:00:02 UTC |

suggests | biglm , LaF , parallel , testthat |

imports | bit , fastmatch |

depends | ff (>= 2.2-11) , R (>= 2.12.0) |

Contributors | Edwin Jonge, Jan der Laan, Jan Wijffels |

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