Python 保存一个 numpy 矩阵
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Save a numpy matrix
提问by CatarinaCM
I have a 3D array and I would like to obtain a 2D image along X-Y with the maximum value of z at each point and save it as a numpy array.
我有一个 3D 数组，我想沿 XY 获取一个 2D 图像，每个点的 z 值都最大值，并将其保存为一个 numpy 数组。
import numpy as num
matrix=num.load('3d')
nx,ny,nz=num.shape(matrix)
CXY=num.zeros([ny, nx])
for i in range(ny):
for j in range(nx):
CXY[i,j]=num.max(matrix[j,i,:])
The problem is to save the obtained matrix. I would like to save it with numpy.save but I always get an empty array. Does anyone have suggestions to properly save the obtained array?
问题是保存得到的矩阵。我想用 numpy.save 保存它，但我总是得到一个空数组。有没有人建议正确保存获得的数组？
I just used num.save:
我刚刚使用了 num.save：
num.save('max', CXY[i,j])
num.save('max', CXY[i,j])
采纳答案by Enfenion
I guess that you're looking for the numpy.savetxt which saves in a human readable format instead of the numpy.save which saves as a binary format.
我猜您正在寻找以人类可读格式保存的 numpy.savetxt 而不是以二进制格式保存的 numpy.save 。
import numpy as np
matrix=np.random.random((10,10,42))
nx,ny,nz=np.shape(matrix)
CXY=np.zeros([ny, nx])
for i in range(ny):
for j in range(nx):
CXY[i,j]=np.max(matrix[j,i,:])
#Binary data
np.save('maximums.npy', CXY)
#Human readable data
np.savetxt('maximums.txt', CXY)
This code saves the array first as a binary file and then as a file you can open in a regular text editor.
此代码首先将数组保存为二进制文件，然后保存为可以在常规文本编辑器中打开的文件。
