The numpy.append() pripojí hodnoty pozdĺž uvedenej osi na koniec poľa Syntax:
numpy.append(array, values, axis = None)>
parametre:
array : [array_like]Input array. values : [array_like]values to be added in the arr. Values should be shaped so that arr[...,obj,...] = values. If the axis is defined values can be of any shape as it will be flattened before use. axis : Axis along which we want to insert the values. By default, array is flattened.>
Návrat :
An copy of array with values being appended at the end as per the mentioned object along a given axis.>
Kód 1 : Pridávanie polí
Python
char tostring java
# Python Program illustrating> # numpy.append()> > import> numpy as geek> > #Working on 1D> arr1>=> geek.arange(>5>)> print>(>'1D arr1 : '>, arr1)> print>(>'Shape : '>, arr1.shape)> > > arr2>=> geek.arange(>8>,>12>)> print>(>'
1D arr2 : '>, arr2)> print>(>'Shape : '>, arr2.shape)> > > # appending the arrays> arr3>=> geek.append(arr1, arr2)> print>(>'
Appended arr3 : '>, arr3)> |
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Výkon :
1D arr1 : [0 1 2 3 4] Shape : (5,) 1D arr2 : [ 8 9 10 11] Shape : (4,) Appended arr3 : [ 0 1 2 3 4 8 9 10 11]>
The časová zložitosť funkcie numpy.append() je O(n), kde n je počet prvkov, ktoré sa pripájajú. To znamená, že čas potrebný na pridanie prvkov sa lineárne zvyšuje s počtom pripájaných prvkov.
The priestorovú zložitosť funkcie numpy.append() je tiež O(n), kde n je počet prvkov, ktoré sa pripájajú. To znamená, že množstvo priestoru potrebného na pridávanie prvkov sa lineárne zvyšuje s počtom pripájaných prvkov.
Kód 2: Hra s osou
Python
# Python Program illustrating> # numpy.append()> > import> numpy as geek> > #Working on 1D> arr1>=> geek.arange(>8>).reshape(>2>,>4>)> print>(>'2D arr1 :
'>, arr1)> print>(>'Shape : '>, arr1.shape)> > > arr2>=> geek.arange(>8>,>16>).reshape(>2>,>4>)> print>(>'
2D arr2 :
'>, arr2)> print>(>'Shape : '>, arr2.shape)> > > # appending the arrays> arr3>=> geek.append(arr1, arr2)> print>(>'
Appended arr3 by flattened : '>, arr3)> > # appending the arrays with axis = 0> arr3>=> geek.append(arr1, arr2, axis>=> 0>)> print>(>'
Appended arr3 with axis 0 :
'>, arr3)> > # appending the arrays with axis = 1> arr3>=> geek.append(arr1, arr2, axis>=> 1>)> print>(>'
Appended arr3 with axis 1 :
'>, arr3)> |
trieda java skenera
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Výkon :
2D arr1 : [[0 1 2 3] [4 5 6 7]] Shape : (2, 4) 2D arr2 : [[ 8 9 10 11] [12 13 14 15]] Shape : (2, 4) Appended arr3 by flattened : [ 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15] Appended arr3 with axis 0 : [[ 0 1 2 3] [ 4 5 6 7] [ 8 9 10 11] [12 13 14 15]] Appended arr3 with axis 1 : [[ 0 1 2 3 8 9 10 11] [ 4 5 6 7 12 13 14 15]]>