nlcpy.append

nlcpy.append(arr, values, axis=None)

Appends values to the end of an array.

Parameters

arrarray_like

Values are appended to a copy of this array.

valuesarray_like

These values are appended to a copy of arr. It must be of the correct shape (the same shape as arr, excluding axis). If axis is not specified, values can be any shape and will be flattened before use.

axisint, optional

The axis along which values are appended. If axis is not given, both arr and values are flattened before use.

Returns

appendndarray

A copy of arr with values appended to axis. Note that append does not occur in-place: a new array is allocated and filled. If axis is None, out is a flattened array.

参考

insert

Inserts values along the given axis before the given indices.

delete

Returns a new array with sub-arrays along an axis deleted.

Examples

>>> import nlcpy as vp
>>> vp.append([1, 2, 3], [[4, 5, 6], [7, 8, 9]])
array([1, 2, 3, 4, 5, 6, 7, 8, 9])

When axis is specified, values must have the correct shape.

>>> vp.append([[1, 2, 3], [4, 5, 6]], [[7, 8, 9]], axis=0)
array([[1, 2, 3],
       [4, 5, 6],
       [7, 8, 9]])
>>> vp.append([[1, 2, 3], [4, 5, 6]], [7, 8, 9], axis=0) 
Traceback (most recent call last):
    ...
ValueError: all the input arrays must have same number of dimensions