numpy初学者:使用numpy.savetxt编写数组 [英] numpy beginner: writing an array using numpy.savetxt

问题描述

我有一个numpy直方图，我想将其输出为制表符分隔的文本文件.我的代码如下:

I have a numpy histogram that I would like to output as a tab-delimited text file. My code is below:

targethist = np.histogram(targetlist, bins=ilist)
print targethist
np.savetxt('ChrI_dens.txt',targethist,delimiter='\t')

targetlist和ilist是一长串整数.我得到以下输出:

targetlist and ilist are long lists of integers. I get the following output:

(array([0，0，0，...，0，0，0])，array([1，10000，20000， ...，15060000，15070000，15072422]))追溯(最近通话 最后):文件"target_dens_np.py"，位于第62行 np.savetxt('ChrI_dens.txt'，targethist，delimiter ='\ t')文件"/Library/Frameworks/Python.framework/Versions/7.3/lib/python2.7/site-packages/numpy/lib/npyio. py"， 第979行，在savetxt中 fh.write(asbytes(format％tuple(row)+ newline))TypeError:需要float参数，而不是numpy.ndarray

(array([0, 0, 0, ..., 0, 0, 0]), array([ 1, 10000, 20000, ..., 15060000, 15070000, 15072422])) Traceback (most recent call last): File "target_dens_np.py", line 62, in np.savetxt('ChrI_dens.txt',targethist,delimiter='\t') File "/Library/Frameworks/Python.framework/Versions/7.3/lib/python2.7/site-packages/numpy/lib/npyio.py", line 979, in savetxt fh.write(asbytes(format % tuple(row) + newline)) TypeError: float argument required, not numpy.ndarray

似乎已经创建了直方图数组，但是我在np.savetxt()行中做错了什么.我已经阅读了文档，但是不明白为什么此函数中的任何参数都将期望浮点数.我在哪里弄错了?

It seems that the histogram array has been created, but I have done something wrong in the np.savetxt() line. I have read the documentation, but don't understand why any of the arguments in this function would be expecting a float. Where have I gone wrong?

推荐答案

我认为问题在于savetxt的第二个参数必须是类似于数组的".您的输入不是类似数组的".例如

I think that the problem is that the second argument to savetxt must be "array-like". Your input is not "array-like". e.g.

print (len(targethist[0]))
print (len(targethist[1]))

注意长度不一样吗?如果长度相同，则numpy可以将其转换为单个2-D数组，一切都会好起来，但是它无法进行转换，因此会失败.

Notice the lengths aren't the same? If the lengths were the same, numpy could convert it to a single 2-D array and everything would be fine, but it can't do the conversion so it fails.

这有效

np.savetxt('stuff.dat',(targethist[0],targethist[1][1:]),delimiter='\t')

但是我已经删掉了您的数据；).您需要确定要解决的问题.

But I've truncated your data ;). You'll need to decide what you want to do to work around this one.

我必须承认，这里的错误消息非常隐秘.

I must admit, the error message here is quite cryptic.

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