我有一个文本文件,其中包含由选项卡分隔的2列,包含一些我想要读入数组的数据,并执行一些简单的操作,例如绘制数据。第二列中的数据是科学记数法,并且可以采用极小的值,例如从数量级10e-27 10e-50变化。例如,这是一个数据样本
0.00521135 -1.197189e-31
0.00529274 -7.0272737e-32
0.00530917 -6.0163467e-32
0.00532565 -4.9990405e-32
0.00534218 -3.9747722e-32
0.00535876 -2.9457271e-32
0.0053754 -1.9094542e-32
0.00539208 -8.6847519e-33
0.00540882 1.7851373e-33
0.00542561 1.2288483e-32
0.00544245 2.2850705e-32
0.00545934 3.3432858e-32
0.00547629 4.4084594e-32
0.00549329 5.4765499e-32
0.00551034 6.5491709e-32
以下是我的代码:
import numpy as np
import matplotlib.pyplot as plt
with open('data.dat', 'r') as f2:
lines = f2.readlines()
data = [line.split()for line in lines]
data2 = np.asfarray(data)
x1 = data2[:,0]
y1 = data2[:,1]
plt.plot(x1, y1)
plt.show()
我已经使用此代码测试样本数据(.dat格式)文件,它似乎工作正常,但是当我在我的数据集上运行此代码时,它会给我以下错误。
Traceback (most recent call last):
File "read_txt_col.py", line 17, in <module>
data2 = np.asfarray(data)
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages /numpy/lib/type_check.py", line 103, in asfarray
return asarray(a,dtype=dtype)
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/numpy/core/numeric.py", line 235, in asarray
return array(a, dtype, copy=False, order=order)
ValueError: setting an array element with a sequence.
有人可以帮忙!!
答案 0 :(得分:8)
不要重新发明轮子!使用numpy.loadtxt
:
>>> import numpy as np
>>> import matplotlib.pyplot as plt
>>> data = np.loadtxt('data.dat')
>>> x1 = data[:,0]
>>> y1 = data[:,1]
>>> plt.plot(x1, y1)
>>> plt.show()