ffdfrbind.fill
(Package: ffbase) :
rbind for ffdf where missing columns are added if not available in one of the ffdf objects
rbind for ffdf where missing columns are added if not available in one of the ffdf objects.
Similarly as rbind.fill but for ffdf objects
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● Alias: ffdfrbind.fill
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binned_sumsq
(Package: ffbase) :
Fast squared summing in different bins
binned_sum implements fast squared summing for given bins by calling c-code, which can be used to calculate variance and standard deviation Please note that incorrect use of this function may crash your R-session. the values of bins must be in between 1:nbins and bin may not contain NA
● Data Source:
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● Alias: binned_sumsq, binned_sumsq.default, binned_sumsq.ff
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save.ffdf
(Package: ffbase) :
Save ffdf data.frames in a directory
save.ffdf saves all ffdf data.frames in the given dir. Each column is stored as with filename <ffdfname>$<colname>.ff. All variables given in "..." are stored in ".RData" in the same directory. The data can be reloaded by starting a R session in the directory or by using load.ffdf. Note that calling save.ffdf multiple times for the same directory will only store the ffdf's that were given in the last call.
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● Alias: save.ffdf
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pack.ffdf
(Package: ffbase) :
Packs ffdf data.frames into a compressed file
pack.ffdf stores ffdf data.frames into the given file for easy archiving and movement of data. The file can be restored using unpack.ffdf. If file ends with ".zip", the package will be zipped otherwise it will be tar.gz-ed.
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● Alias: pack.ffdf
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+.ff_vector
(Package: ffbase) :
Arithmetic Operators for ff vectors
These binary operators perform arithmetic on numeric ff vectors. Arith family:
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● Alias: *.ff_vector, +.ff_vector, -.ff_vector, /.ff_vector, Arithmetic, %/%.ff_vector, %%.ff_vector, ^.ff_vector
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ffrandom
(Package: ffbase) :
Generate code{ff
A convenience function to generate ff vectors with draws from random distributions using functions such as runif, rnorm and rlnorm.
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● Alias: ffrandom
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subset.ff
(Package: ffbase) :
Subsetting a ff vector or ffdfdata frame
Subsetting a ff vector or ffdfdata frame
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● Alias: subset.ff, subset.ffdf
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sum.ff
(Package: ffbase) :
Sum of code{ff
sum returns the sum of all the values present in its arguments.
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● Alias: sum.ff
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duplicated.ff
(Package: ffbase) :
Duplicated for ff and ffdf objects
Duplicated for ff and ffdf objects similar as in duplicated.
Remark that this duplicated function is slightly different from the duplicated method in the base package as it first orders the ffdf or ff_vector object and then applies duplicated. This means you need to order the ffdf or ff_vector in case you want to have the exact same result as the result of the base package. See the example.
● Data Source:
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● Keywords:
● Alias: duplicated.ff, duplicated.ffdf
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table
(Package: ffbase) :
Cross Tabulation and Table Creation
Upgrades table to a generic function and implements a method for ff vectors which works for ff factors. For other arguments passed on to table, uses table
● Data Source:
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● Alias: table, table.ff
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