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Questions tagged [ffbase]

Basic statistical functions for package ff

R package ffbase provides basic functionality to allow to do basic data operations on ff structures. This functionality is also available in the R base library and ffbase tries to provide the methods needed for ff structures such that switching between in-RAM objects and on-disk objects in ff is more straightforward.

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Why merge does not work on ffdf casted from ff_matrix

Why doesn't merge work in the following? It gives error `Error: require(ff) require(ffbase) a <- ffbase:::as.ff_matrix.ffdf(as.ffdf(data.frame(matrix(rnorm(10),ncol=2)))) b <-…
user2763361
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R package ff with cross products of a number of different keys fails

I am coming across difficulties using the ff package, when attempting to create cross-products of a number of different keys. Using expand.ffgrid(), there are no issues when passing individual ff objects as below: test_ff <-…
Dimitris
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How to cast ffdf to ff

I am using the read.table.ffdf function from the ff package to read a gigantic matrix of numbers. How do I then cast this resulting ffdf object to an ff object without first converting to RAM?
user2763361
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Conditional Character Column ffdf data

I imported a big dataset (~6 million rows) to R using ffbase package that lists people enrolled in high school in Brazil. In principle, I have 2 columns: Id (Student Id Number) and University (Institution’s name). I would like to create a column -…
phill
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