getGenome

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Description

Function to obtain a genome

Usage

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getGenome(genome)

Arguments

genome

The genome object or genome identifier.

Details

If genome is a BSgenome (from the package BioStrings), it will transform it into a GRanges with chromosomes and chromosome lengths.

If genome is a data.frame with 3 columns, it will transform it into a GRanges.

If genome is a data.frame with 2 columns, it will assume the first is the chromosome, the second is the length of the chromosomes and will add 1 as start.

If genome is a character string uniquely identifying a BSgenome installed in the system (e.g. "hg19", "mm10",... but not "hg"), it will create a genome based on the BSgenome object identified by the character string.

If genome is a GRanges object, it will return it as is.

If genome is non of the above, it will give a warning and try to transform it into a GRanges using toGRanges. This can be helpful if genome is a connection to a file.

Value

A GRanges object with the "genome" data c(Chromosome, Start (by default, 1), Chromosome Length) given a BSgenome, a genome name, a data.frame or a GRanges.

A GRanges representing the genome with one region per chromosome.

Note

This function is memoised (cached) using the memoise package. To empty the cache, use forget(getGenome)

Please note that passing this function the path to a file will not work, since it will assume the character is the identifier of a genome. To read the genome from a file, please use getGenome(toGRanges("path/to/file"))

See Also

getMask, getGenomeAndMask, characterToBSGenome, maskFromBSGenome, emptyCacheRegioneR

Examples

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getGenome("hg19")

getGenome(data.frame(c("chrA", "chrB"), c(15000000, 10000000)))
 

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