将2D数组转换为3D numpy数组 [英] Convert 2D array to 3D numpy array

问题描述

我创建了一个numpy数组，该数组的每个元素都包含一个形状相同的数组(9,5).我想要的是3D阵列.

I have a created a numpy array, each element of the array contains an array of the same shape (9,5). What I want is a 3D array.

我尝试使用np.stack.

I've tried using np.stack.

data = list(map(lambda x: getKmers(x, 9), data)) # getKmers creates a       
                                                 # list of list from a pandas dataframe
data1D = np.array(data)                          # shape (350,)
data2D = np.stack(data1D)

---

data1D:
array([list([      pdbID  AtomNo Type      Eta    Theta
0  1a9l.pdb     2.0    G  169.225  212.838
1  1a9l.pdb     3.0    G  168.439  206.785
2  1a9l.pdb     4.0    U  170.892  205.845
3  1a9l.pdb     5.0    G  164.726  225.982
4  1a9l.pdb     6.0    A  308.788  144.370
5  1a9l.pdb     7.0    C  185.211  209.363
6  1a9l.pdb     8.0    U  167.612  216.614
7  1a9l.pdb     9.0    C  168.741  219.239
8  1a9l.pdb    10.0    C  163.639  207.044,       pdbID  AtomNo Type          Eta    Theta
1  1a9l.pdb     3.0    G  168.439  206.785
2  1a9l.pdb     4.0    U  170.892  205.845
3  1a9l.pdb     5.0    G  164.726  225.982
4  1a9l.pdb     6.0    A  308.788  144.370
5  1a9l.pdb     7.0    C  185.211  209.363
6  1a9l.pdb     8.0    U  167.612  216.614
7  1a9l.pdb     9.0    C  168.741  219.239
8  1a9l.pdb    10.0    C  163.639  207.044

我收到此错误:无法将尺寸为9的序列复制到尺寸为5的数组轴上

I get this error: cannot copy sequence with size 9 to array axis with dimension 5

我想创建一个3D矩阵，其中每个子数组都在新的3D维度中.我猜想新形状是(9,5,350)

I want to create a 3D Matrix, where every subarray is in the new 3D dimension. I gues the new shape would be (9,5,350)

推荐答案

您需要使用

 data.reshape((data.shape[0], data.shape[1], 1))

示例

来自numpy导入数组的

from numpy import array
data = [[11, 22],
    [33, 44],
    [55, 66]]
data = array(data)
print(data.shape)
data = data.reshape((data.shape[0], data.shape[1], 1))
print(data.shape)

运行示例首先打印2D数组中每个尺寸的大小，重新排列数组的形状，然后总结新3D数组的形状.

Running the example first prints the size of each dimension in the 2D array, reshapes the array, then summarizes the shape of the new 3D array.

结果

(3,2)
(3,2,1)

来源: https://machinelearningmastery.com/index-slice-reshape-numpy-arrays-machine-learning-python/

这篇关于将2D数组转换为3D numpy数组的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！