countRangeset {systemPipeR} | R Documentation

## Read counting for several range sets

### Description

Convenience function to perform read counting iteratively for serveral range sets, e.g. peak range sets or feature types. Internally, the read counting is performed with the `summarizeOverlaps` function from the `GenomicAlignments` package. The resulting count tables are directly saved to files.

### Usage

    countRangeset(bfl, args, format="tabular", ...)

### Arguments

`bfl` | `BamFileList` object containing paths to one or more BAM files.
`args` | Object of class `SYSargs` where `infile1(args)` specifies the paths to the tabular range data files (e.g. peak ranges) used for counting.
`format` | Format of input range files. Currently, supported are `tabular` or `bed`. If `tabular` is selected then the input range files need to contain the proper column titles to coerce with `as(..., "GRanges")` to `GRanges` objects after importing them with `read.delim`. The latter is the case for the peak files (`*peaks.xls`) generated by the MACS2 software.
`...` | Arguments to be passed on to internally used `summarizeOverlaps` function.

### Value

Named character vector containing the paths from `outpaths(args)` to the resulting count table files.

### Author(s)

Thomas Girke

### See Also

`summarizeOverlaps`

### Examples

    ## Paths to BAM files
    param <- system.file("extdata", "bowtieSE.param", package="systemPipeR")
    targets <- system.file("extdata", "targets.txt", package="systemPipeR")
    args_bam <- systemArgs(sysma=param, mytargets=targets)
    bfl <- BamFileList(outpaths(args_bam), yieldSize=50000, index=character())

    ## Not run:
    ## SYSargs with paths to range data and count files
    args <- systemArgs(sysma="param/count_rangesets.param", mytargets="targets_macs.txt")

    ## Iterative read counting
    countDFnames <- countRangeset(bfl, args, mode="Union", ignore.strand=TRUE)
    writeTargetsout(x=args, file="targets_countDF.txt", overwrite=TRUE)

    ## End(Not run)

[Package systemPipeR version 1.16.1 Index]