将多个numpy数组写入文件 [英] Write multiple numpy arrays to file

问题描述

我知道如何使用numpy.savetxt将数组写入文件。如何将多个数组写入同一个文件？

I know how to use numpy.savetxt to write an array to a file. How can I write multiple arrays to the same file?

基本上我想对一列数字进行数学运算，然后用修改后的数字替换旧列。我读到最简单的方法是完全写一个新文件，将修改后的数字放入，然后复制并粘贴文件中的其他数字。

Essentially I want to do math to a column of numbers, and then replace the old column with the modified numbers. I read the easiest way to do this is to write a new file completely, put the modified numbers in, and just 'copy and paste' the other numbers in the file.

感谢任何帮助。

谢谢！

推荐答案

如果您想将多个数组写入文件供以后使用，请查看 numpy.savez 。

If you're wanting to write multiple arrays to a file for later use, Look into numpy.savez.

但是，根据你的描述，它听起来像你'我想要对分隔文本文件的特定列做一些事情。

However, from your description, it sounds like you're wanting to do something with a particular column of a delimited text file.

在这种情况下，只需加载整个内容并操作您需要的列。

In that case, just load the entire thing in and operate on just the column you need to.

例如

import numpy as np

data = np.loadtxt('test.txt')

# Multiply the 4th column by 5
data[:,3] *= 5

# Do something more complicated to the 2nd column
data[:,1] = np.cos(data[:,1])

# Save the array back to the file
np.savetxt('test.txt', data)

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