我从具有2列的.txt文件中制作了一个数据框。我有一个特定的索引范围(3751:6252),我想为此绘制第1列(频率)与第2列(相位)的关系。
我该怎么做?
import numpy as np
import pandas as pd
import matplotlib.pyplot as plt
import seaborn as sns
#open text file and save it as a df (dataframe)
textfile = pd.read_csv("RawPhaseData.txt", sep='\s+', skiprows= 2, header=None, names = ['freq', 'phase'])
#make the index equal to frequency
#textfile.set_index("freq", inplace=True)
p = textfile[3751:6252]
x = p['freq']
y = p['phase']
plt.plot(x,y)
plt.show()
期望图形,但是没有输出。
我说出print(p)的部分结果
freq phase
3751 0.55000000000000 -51.101839657065
3752 0.55004000000000 -51.251119837268
3753 0.55008000000000 -51.400516517531
3754 0.55012000000000 -51.550029980720
3755 0.55016000000000 -51.699660509792
3756 0.55020000000000 -51.849408387787
....
我说出print(x)的部分结果
3751 0.55000000000000
3752 0.55004000000000
3753 0.55008000000000
3754 0.55012000000000
3755 0.55016000000000
3756 0.55020000000000
3757 0.55024000000000
3758 0.55028000000000
3759 0.55032000000000
....
我说print(y)时的部分结果
3751 -51.101839657065
3752 -51.251119837268
3753 -51.400516517531
3754 -51.550029980720
3755 -51.699660509792
3756 -51.849408387787
3757 -51.999273897829
....
答案 0 :(得分:1)
也许您需要在导入后内联添加%matplotlib。
import matplotlib.pyplot as plt
%matplotlib inline