How to plot multiple set of data from same text file in matplotlib

Question

I have data file say data.txt as,

Note there are two set of data. I want to plot them in same graph. In gnuplot it is very simple we just have to run plot 'data.txt' with line and we will get a graph like this,

Actually I have 50 such set in the same data file. I have just started learning python. I want to plot this data file using numpy and matplotlib.

There are similar threads in this forum like,

How to plot data from multiple two column text files with legends in Matplotlib?

How can you plot data from a .txt file using matplotlib?

but I could not find anything similar to my issue.

Can you show the code that you have?

DavidG
– DavidG

2017-10-10 09:37:39 +00:00
Commented Oct 10, 2017 at 9:37 — DavidG
– DavidG, Commented Oct 10, 2017 at 9:37

ImportanceOfBeingErnest · Accepted Answer · 2017-10-10 09:55:07Z

0

One idea can be to read the complete file, split it at the positions where a double line break occurs, .split('\n\n') and read in each part using numpy.loadtxt.

import numpy as np
from io import StringIO 
import matplotlib.pyplot as plt

filename="data.txt"
with open(filename) as f:
    data = f.read()

data = data.split('\n\n')

for d in data:
    ds = np.loadtxt(StringIO(unicode(d)))
    plt.plot(ds[:,0],ds[:,1])

plt.show()

answered Oct 10, 2017 at 9:55

ImportanceOfBeingErnest

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1 Comment

ddas Over a year ago

unicode gave a NameError while running with python3 because Python 3 renamed the unicode type to str. After replacing it with str it worked, thanks for your help.

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