Calculate ranges x cells tile overlap matrix

## Usage

```
tile_matrix(
fragments,
ranges,
zero_based_coords = !is(ranges, "GRanges"),
explicit_tile_names = FALSE
)
```

## Arguments

- fragments
Input fragments object

- ranges
Tiled regions given as GRanges, data.frame, or list. See

`help("genomic-ranges-like")`

for details on format and coordinate systems. Required attributes:`chr`

,`start`

,`end`

: genomic position`tile_width`

: Size of each tile in this region in basepairs

Must be non-overlapping and sorted by (chr, start), with chromosomes ordered according to the chromosome names of

`fragments`

- zero_based_coords
Whether to convert the ranges from a 1-based end-inclusive coordinate system to a 0-based end-exclusive coordinate system. Defaults to true for GRanges and false for other formats (see this archived UCSC blogpost)

- explicit_tile_names
Boolean for whether to add rownames to the output matrix in format e.g chr1:500-1000, where start and end coords are given in a 0-based coordinate system. For whole-genome Tile matrices the names will take ~5 seconds to generate and take up 400MB of memory. Note that either way, tile names will be written when the matrix is saved.

## Value

Iterable matrix object with dimension ranges x cells. When saved, the column names will be in the format chr1:500-1000, where start and end coords are given in a 0-based coordinate system.

## Note

When calculating the matrix directly from a fragments tsv, it's necessary to first call `select_chromosomes()`

in order to
provide the ordering of chromosomes to expect while reading the tsv.