shrinkageFun-method {biovizBase} | R Documentation

## Shrinkage function

### Description

Create a shrinkage function based on specified gaps and shrinkage rate.

### Usage

    ## For IRanges
    ## S4 method for signature 'IRanges'
    shrinkageFun(obj, max.gap = 1L)

    ## For GenomicRanges
    ## S4 method for signature 'GenomicRanges'
    shrinkageFun(obj, max.gap = 1L)

    is_coord_truncate_gaps(obj)

### Arguments

`obj` | GenomicRanges object which represent gaps
`max.gap` | Gaps to be kept, it's a fixed value, if this value is bigger than certain gap interval, then that gap is not going to be shrunk.

### Details

`shrinkageFun` function will read in a GenomicRanges object which represent the gaps, and return a function which works for another GenomicRanges object, to shrink that object based on previously specified gaps shrinking information. You could use this function to treat multiple tracks(e.g. GRanges) to make sure they shrunk based on the common gaps and the same ratio.

`is_coord_truncate_gaps` is used to check if a `GRanges` object is in "truncate_gaps" coordiantes or not.

### Value

A shrinkage function which could shrink a GenomicRanges object, this function will add coord "truncate_gaps" and max.gap to metadata, ".ori" for oringal data as extra column

### Author(s)

Michael Lawrence, Tengfei Yin

### Examples

    library(GenomicRanges)
    gr1 <- GRanges("chr1", IRanges(start = c(100, 300, 600),
                                   end = c(200, 400, 800)))

    shrink.fun1 <- shrinkageFun(gaps(gr1), max.gap = maxGap(gaps(gr1), 0.1))
    shrink.fun2 <- shrinkageFun(gaps(gr1, start(gr1), end(gr1)), max.gap = maxGap(gaps(gr1), 0.1))
    shrink.fun3 <- shrinkageFun(gaps(gr1), max.gap = 0)
    s1 <- shrink.fun1(gr1)
    s2 <- shrink.fun2(gr1)
    s3 <- shrink.fun3(gr1)
    metadata(s1)$coord
    values(s1)$.ori
    is_coord_truncate_gaps(s1)

[Package biovizBase version 1.40.0 Index]