concatenate(seq, axis=0, allow_unknown_chunksizes=False)

Given a sequence of dask Arrays form a new dask Array by stacking them along an existing dimension (axis=0 by default)

Parameters

seq: list of dask.arrays :

axis: int :

Dimension along which to align all of the arrays

allow_unknown_chunksizes: bool :

Allow unknown chunksizes, such as come from converting from dask dataframes. Dask.array is unable to verify that chunks line up. If data comes from differently aligned sources then this can cause unexpected results.

Concatenate arrays along an existing axis

See Also

stack

Examples

Create slices

This example is valid syntax, but we were not able to check execution

>>> import dask.array as da
... import numpy as np

This example is valid syntax, but we were not able to check execution

>>> data = [da.from_array(np.ones((4, 4)), chunks=(2, 2))
...          for i in range(3)]

This example is valid syntax, but we were not able to check execution

>>> x = da.concatenate(data, axis=0)
... x.shape
(12, 4)

This example is valid syntax, but we were not able to check execution

>>> da.concatenate(data, axis=1).shape
(4, 12)

Result is a new dask Array

See :

Back References

The following pages refer to to this document either explicitly or contain code examples using this.

dask.array.core.stack dask.array.core.block dask.array.core.concatenate

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