grd_data: Grid data interface
In paleolimbot/grd: Raster and Grid Geometry

Description Usage Arguments Value Examples

Grid data interface

grd_data(grid)

grd_data_ptype(grid_data)

## S3 method for class 'array'
grd_data_ptype(grid_data)

grd_data_collect(
  grid_data,
  i = NULL,
  j = NULL,
  ...,
  ptype = grd_data_ptype(grid_data)
)

## S3 method for class 'array'
grd_data_collect(
  grid_data,
  i = NULL,
  j = NULL,
  ...,
  ptype = grd_data_ptype(grid_data)
)

grd_data_subset(grid_data, i = NULL, j = NULL, ...)

## Default S3 method:
grd_data_subset(grid_data, i = NULL, j = NULL, ...)

## S3 method for class 'nativeRaster'
grd_data_subset(grid_data, i = NULL, j = NULL, ...)

grd_data_order(grid_data)

## Default S3 method:
grd_data_order(grid_data)

## S3 method for class 'nativeRaster'
grd_data_order(grid_data)

`grid`	A `grd_xy()`, `grd_rct()`, or other object implementing `grd_*()` methods.
`grid_data`	The `data` member of a `grd()`. This is typically an array but can also be an S3 object with the proper methods implemented (e.g., `grd_data_generic()`).
`i, j`	1-based index values. `i` indices correspond to decreasing `y` values; `j` indices correspond to increasing `x` values. Values outside the range `1:nrow\|ncol(data)` will be censored to `NA` including 0 and negative values.
`...`	Passed to S3 methods.
`ptype`	The R object type that should be used to represent the data.

grd_data() returns the data member of a grd().
grd_data_subset() returns a subset of the data independent of the parent grd() but using the same indexing rules as grd_subset(). The non-xy dimensions of grid_data are not affected.
grd_data_order() returns c("y", "x") for data with a column-major internal ordering and c("x", "y") for data with a row-major internal ordering. Both 'x' and 'y' can be modified with a negative sign to indicate right-to-left or bottom-to-top internal ordering, respectively. This value does not affect the axis order or axis direction used to index in grd_subset() or grd_data_subset().