如何在 txt 文件上写一个只有整数的 numpy 二维数组

Question

我知道如何使用 numpy.savetxt() 编写 txt 文件，但我无法让它仅使用整数来编写文件。我有以下代码：

new_picks = new_picks.astype(int)
np.savetxt(fname='newPicksData.txt', X=new_picks.astype(int))

这是我得到的矩阵的样子：

2.900000000000000000e+01 3.290000000000000000e+02 1.000000000000000000e+00
4.300000000000000000e+01 1.080000000000000000e+02 1.000000000000000000e+00
4.300000000000000000e+01 1.950000000000000000e+02 1.000000000000000000e+00
5.600000000000000000e+01 1.510000000000000000e+02 1.000000000000000000e+00
5.600000000000000000e+01 9.700000000000000000e+01 1.000000000000000000e+00
7.000000000000000000e+01 2.840000000000000000e+02 1.000000000000000000e+00
3.500000000000000000e+01 3.170000000000000000e+02 1.000000000000000000e+00
5.400000000000000000e+01 2.110000000000000000e+02 1.000000000000000000e+00
6.400000000000000000e+01 1.180000000000000000e+02 1.000000000000000000e+00
5.400000000000000000e+01 3.700000000000000000e+01 1.000000000000000000e+00
1.300000000000000000e+01 1.950000000000000000e+02 1.000000000000000000e+00
1.300000000000000000e+01 1.680000000000000000e+02 1.000000000000000000e+00
1.300000000000000000e+01 2.780000000000000000e+02 1.000000000000000000e+00
4.900000000000000000e+01 2.200000000000000000e+01 1.000000000000000000e+00
4.900000000000000000e+01 1.040000000000000000e+02 1.000000000000000000e+00
4.900000000000000000e+01 7.500000000000000000e+01 1.000000000000000000e+00
5.400000000000000000e+01 2.610000000000000000e+02 1.000000000000000000e+00
5.400000000000000000e+01 2.600000000000000000e+02 1.000000000000000000e+00
5.400000000000000000e+01 1.150000000000000000e+02 1.000000000000000000e+00
5.400000000000000000e+01 5.400000000000000000e+01 1.000000000000000000e+00
1.300000000000000000e+01 5.400000000000000000e+01 1.000000000000000000e+00
4.900000000000000000e+01 5.400000000000000000e+01 1.000000000000000000e+00

我要找的是这样的：

29 329 1
43 108 1
43 195 1
56 151 1
56 97 1

Answer 1

您必须使用 fmt 参数单独指定格式，请参阅此处的文档 http://docs.scipy.org/doc/numpy/reference/generated/numpy.savetxt.html

您必须使用以下语法来获得您想要的内容：

np.savetxt(fname='newPicksData.txt', X=new_picks.astype(int),fmt="%i")

省略该参数，默认为 fmt='%.18e'，这正是您在问题中发布的输出中看到的内容。

---

此外，您的代码中真的需要 astype(int) 部分吗？ np.savetext 命令可以将 strings/doubles 完美地格式化为 int 而无需您自己更改数据。这可以用下面的代码块来演示：

import numpy
x = numpy.array([1.3,2.1,3.9,4.2,5.5,6.1])
numpy.savetxt(fname='newPicksData.txt', X=x, fmt="%i")

列出的代码块然后生成以下文本文件：

1
2
3
4
5
6

Answer 2

您必须在

中添加一个额外的参数

savetxt(fname='newPicksData.txt', X=new_picks.astype(int), fmt ='%.0f\n')

这只是实际数字的格式。