ssvFetchBigwig {seqsetvis} | R Documentation

## Iterates a character vector (ideally named) and calls `ssvFetchBigwig.single` on each. Appends grouping variable to each resulting data.table and uses rbindlist to efficiently combine results.

### Description

`ssvFetchBigwig` iteratively calls `fetchWindowedBigwig.single`. See `ssvFetchBigwig.single` for more info.

### Usage

    ssvFetchBigwig(file_paths, qgr, unique_names = NULL,
      names_variable = "sample", win_size = 50, win_method = c("sample",
      "summary")[1], summary_FUN = stats::weighted.mean, anchor = c("left",
      "left_unstranded", "center", "center_unstranded")[3],
      return_data.table = FALSE, n_cores = getOption("mc.cores", 1))

### Arguments

`file_paths` | character vector of file_paths to load from. Alternatively, file_paths can be a data.frame or data.table whose first column is a character vector of paths and additial columns will be used as metadata.
`qgr` | Set of GRanges to query. For valid results the width of each interval should be identical and evenly divisible by `win_size`.
`unique_names` | names to use in final data.table to designate source bigwig.
`names_variable` | The column name where unique_names are stored. Default is 'sample'
`win_size` | The window size that evenly divides widths in `qgr`.
`win_method` | character. one of c("sample", "summary"). Determines if `viewGRangesWinSample_dt` or `viewGRangesWinSummary_dt` is used to represent each region in qgr.
`summary_FUN` | function. only relevant if win_method is "summary". passed to `viewGRangesWinSummary_dt`.
`anchor` | character, one of c("center", "center_unstranded", "left", "left_unstranded")
`return_data.table` | logical. If TRUE the internal data.table is returned instead of GRanges. Default is FALSE.
`n_cores` | integer number of cores to use. Uses mc.cores option if not supplied.

### Details

if `qgr` contains the range chr1:1-100 and `win_size` is 10, values from positions chr1 5,15,25...85, and 95 will be retrieved from `bw_file`

### Value

A tidy formatted GRanges (or data.table if specified) containing fetched values.

### Examples

    if(Sys.info()['sysname'] != "Windows"){
    library(GenomicRanges)
    bw_f = system.file("extdata/test_loading.bw",
        package = "seqsetvis", mustWork = TRUE)
    bw_files = c("a" = bw_f, "b" = bw_f)
    qgr = GRanges("chrTest", IRanges(1, 30))
    bw_gr = ssvFetchBigwig(bw_files, qgr, win_size = 10)
    bw_gr2 = ssvFetchBigwig(as.list(bw_files), qgr, win_size = 10)

    bw_dt = ssvFetchBigwig(bw_files, qgr, win_size = 10,
        return_data.table = TRUE)
    }

[Package seqsetvis version 1.6.0 Index]