Zarr Array

This class implements a Zarr array. A Zarr array is stored in a node in the hierarchy of a Zarr data set. The array contains the data for an object.

Super class

zarr::zarr_node -> zarr_array

Active bindings

data_type

(read-only) Retrieve the data type of the array.

shape

(read-only) Retrieve the shape of the array, an integer vector.

chunking

(read-only) The chunking engine for this array.

chunk_separator

(read-only) Retrieve the separator to be used for creating store keys for chunks.

codecs

The list of codecs that this array uses for encoding data (and decoding in inverse order).

Methods

Public methods

• zarr_array$new()

• zarr_array$print()

• zarr_array$hierarchy()

• zarr_array$read()

• zarr_array$write()

Inherited methods

• zarr::zarr_node$delete_attributes()
• zarr::zarr_node$print_attributes()
• zarr::zarr_node$save()
• zarr::zarr_node$set_attribute()

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Method new()

Initialize a new array in a Zarr hierarchy. The array must already exist in the store

Usage

zarr_array$new(name, metadata, parent, store)

Arguments

name

The name of the array.

metadata

List with the metadata of the array.

parent

The parent zarr_group instance of this new array, can be missing or NULL if the Zarr object should have just this array.

store

The zarr_store instance to persist data in.

Returns

An instance of zarr_array.

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Method print()

Print a summary of the array to the console.

Usage

zarr_array$print()

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Method hierarchy()

Prints the hierarchy of the groups and arrays to the console. Usually called from the Zarr object or its root group to display the full group hierarchy.

Usage

zarr_array$hierarchy(idx, total)

Arguments

idx, total

Arguments to control indentation.

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Method read()

Read some or all of the array data for the array.

Usage

zarr_array$read(selection)

Arguments

selection

A list as long as the array has dimensions where each element is a range of indices along the dimension to write. If missing, the entire array will be read.

Returns

A vector, matrix or array of data.

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Method write()

Write data for the array. The data will be chunked, encoded and persisted in the store that the array is using.

Usage

zarr_array$write(data, selection)

Arguments

data

An R vector, matrix or array with the data to write. The data in the R object has to agree with the data type of the array.

selection

A list as long as the array has dimensions where each element is a range of indices along the dimension to write. If missing, the entire data object will be written.

Returns

Self, invisibly.