Importing data as an array for plotting in Python

Question

I am new to this question. I hop to get benefit of your advice. Sorry if it is amateurish.

I have the following code which finally shows a plot. I just write one part of code.

...
cov = np.dot(A, A.T)
samps2 = np.random.multivariate_normal([0]*ndim, cov, size=nsamp)
print(samps2)
names = ["x%s"%i for i in range(ndim)]
labels =  ["x_%s"%i for i in range(ndim)]
samples2 = MCSamples(samples=samps2,names = names, labels = labels, label='Second set')
g = plots.getSubplotPlotter()
g.triangle_plot([samples2], filled=True)

It has no problem. The plot is drawn using the data coming from samps2. To see what the samps2 is, we do print(samps2) and see:

[[-0.11213986 -0.0582685 ]
 [ 0.20346731  0.25309022]
 [ 0.22737737  0.2250694 ]
 [-0.09544588 -0.12754274]
 [-1.05491483 -1.15432073]
 [-0.31340717 -0.36144749]
 [-0.99158936 -1.12785124]
 [-0.5218308  -0.59193326]
 [ 0.76552123  0.82138362]
 [ 0.65083618  0.70784292]]

My question is, If I want to read these data from a txt file. what should I do?

Thank you.

SpghttCd · Accepted Answer · 2018-10-10 22:14:50Z

3

There are several ways. What comes to my mind is:

plain python:

data = []
with open(filename, 'r') as f:
    for line in f:
        data.append([float(num) for num in line.split()])

numpy:

import numpy as np
data = np.genfromtxt(filename, ...)

pandas:

import pandas as pd
df = pd.read_table(filename, sep='\s+', header=None)

answered Oct 10, 2018 at 22:14

SpghttCd

10.9k2 gold badges23 silver badges28 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Ehsan Over a year ago

Thank you so much my friend for you complete answer. I dont know why, but just numpy is working.

SpghttCd Over a year ago

You're welcome. I think the three are very similar, except that pandas uses dataframes instead of plain arrays, but still: I don't know what you mean by not working, so perhaps your approach for some reason fits only to numpy arrays, but not to lists or dataframes.

Collectives™ on Stack Overflow

Importing data as an array for plotting in Python

1 Answer 1

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related