numpy.append¶

numpy.
append
(arr, values, axis=None)[source]¶ Append 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 inplace: a new array is allocated and filled. If axis is None, out is a flattened array.
Examples
>>> np.append([1, 2, 3], [[4, 5, 6], [7, 8, 9]]) array([1, 2, 3, ..., 7, 8, 9])
When axis is specified, values must have the correct shape.
>>> np.append([[1, 2, 3], [4, 5, 6]], [[7, 8, 9]], axis=0) array([[1, 2, 3], [4, 5, 6], [7, 8, 9]]) >>> np.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, but the array at index 0 has 2 dimension(s) and the array at index 1 has 1 dimension(s)