python-2.7 – 如何在python中保存3D数组并在mathematica中导入

发布时间：2020-12-20 11:47:47 所属栏目：Python 来源：网络整理

导读：我想在 python上的.txt文件或.csv文件中保存一个3D二进制数组,并将其导入到mathematica中. 我用Google搜索,我找到了很多答案,我试试这个： import numpy as npa=np.zeros((2,3,4))a[0,0]=10cPickle.dump( a,open( "matrix.txt","wb" ) ) 在mathematica中我使

我想在 python上的.txt文件或.csv文件中保存一个3D二进制数组,并将其导入到mathematica中.

我用Google搜索,我找到了很多答案,我试试这个：

import numpy as np
a=np.zeros((2,3,4))
a[0,0]=10
cPickle.dump( a,open( "matrix.txt","wb" ) )

在mathematica中我使用了Import [“matrix.txt”,“Data”]而我没有得到我所期望的

IN[]:Import["matrix.txt","Data"]

  Out[]:{{"cnumpy.core.multiarray"},{"_reconstruct"},{"p1"},{"(cnumpy"},
    {"ndarray"},{"p2"},{"(I0"},{"tS'b'"},{"tRp3"},{"(I1"},{"(I2"},
    {"I3"},{"I4"},{"tcnumpy"},{"dtype"},{"p4"},{"(S'f8'"},{"I0"},
    {"I1"},{"tRp5"},{"(I3"},{"S'<'"},{"NNNI-1"},{"I-1"},
    {"tbI00"},
    {"S'x00x00x00x00x00x00$@x00x00x00x00x00x00
    x00x00x00x00x00x00x00x00x00x00x00x00x00x00
    x00x00x00x00x00x00x00x00x00x00x00x00x00x00
    x00x00x00x00x00x00x00x00x00x00x00x00x00x00
    x00x00x00x00x00x00x00x00x00x00x00x00x00x00
    x00x00x00x00x00x00x00x00x00x00x00x00x00x00
    x00x00x00x00x00x00x00x00x00x00x00x00x00x00
    x00x00x00x00x00x00x00x00x00x00x00x00x00x00
    x00x00x00x00x00x00x00x00x00x00x00x00x00x00
    x00x00x00x00x00x00x00x00x00x00x00x00x00x00
    x00x00x00x00x00x00x00x00x00x00x00x00x00x00
    x00x00x00x00x00x00x00x00x00x00x00x00x00x00
    x00x00x00x00x00x00x00x00x00x00x00x00x00x00
    x00x00x00x00x00x00x00x00x00x00'"},{"tb."}}

解决方法

诀窍是将数组展平为2D数组：

import numpy as np
a=np.zeros((2,0]=10
b=a.reshape(1,24)

np.savetxt("/matrix.CSV",b,delimiter=',')

然后在导入后在Mathematica中将其转换为3D,我们可以使用：

file=Import["matrix.CSV","Data"]
 matrix=ArrayReshape[file,{2,4}]

（编辑：李大同）

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