python numpy savetxt [英] python numpy savetxt

问题描述

有人可以在这里指出我在做什么错吗?

Can someone indicate what I am doing wrong here?

import numpy as np

a = np.array([1,2,3,4,5],dtype=int)
b = np.array(['a','b','c','d','e'],dtype='|S1')

np.savetxt('test.txt',zip(a,b),fmt="%i %s")

输出为:

Traceback (most recent call last):
  File "loadtxt.py", line 6, in <module>
    np.savetxt('test.txt',zip(a,b),fmt="%i %s")
  File "/Users/tom/Library/Python/2.6/site-packages/numpy/lib/io.py", line 785, in savetxt
    fh.write(format % tuple(row) + '\n')
TypeError: %d format: a number is required, not numpy.string_

推荐答案

您需要以其他方式构造数组:

You need to construct you array differently:

z = np.array(zip([1,2,3,4,5], ['a','b','c','d','e']), dtype=[('int', int), ('str', '|S1')])
np.savetxt('test.txt', z, fmt='%i %s')

在传递序列时，savetext执行

when you're passing a sequence, savetext performs asarray(sequence) call and resulting array is of type |S4, that is all elements are strings! that's why you see this error.

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