Python output readable in Matlab

Question

I am a Python newbie and am trying to write a numpy array into format readable in Matlab in the following format into an array [xi, yi, ti], separated by a semi-colon.

In python, I am able to currently write it in the following form, which is a numpy array printed on screen/written to file as [[xi yi ti]].

Here is the code:

import math
import random
import numpy as np
SPOT = []
f = open('data_dump.txt', 'a')
for i in range(10):
    X = random.randrange(6)
    Y = random.randrange(10)
    T = random.randrange(5)
    SPOT.append([X,Y,T])
SPOT = np.array(SPOT)
f.write(str(SPOT[:]))   
f.close()

Please suggest how I should proceed to be able to write this data in Matlab readable format as mentioned above. Thanks in advance!

Sree.

Please edit your question by adding this code to it. Nothing can be done with it as a comment — Nobi
– Nobi, Commented Jul 1, 2014 at 4:24
What do the first few lines of data_dump.txt look like? You can probably read it into Matlab as is. — Pursuit
– Pursuit, Commented Jul 1, 2014 at 5:22

CT Zhu · Accepted Answer · 2014-07-01 05:24:16Z

2

It is not very necessary to write your array into a special format. Write it into a normal csv and use dlmread to open it in matlab.

In numpy side, write your array using np.savetxt('some_name.txt', aar, delimiter=' ')

answered Jul 1, 2014 at 5:24

CT Zhu

54.6k18 gold badges125 silver badges136 bronze badges

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

1 Comment

user3792245 Over a year ago

Thanks everyone! @CT Zhu: I tried using np.savetxt now and it seems to work! Added the following and it writes into a format that is readable in Matlab as an array directly. Thanks again! np.savetxt('test.txt', SPOT, fmt = '%10.5f', delimiter=',', newline = ';\n', header='data =[...', footer=']', comments = '#')

emesday · Accepted Answer · 2014-07-01 05:25:50Z

2

Try scipy.io to export data for Matlab

import scipy.io as sio

matlab_data = dict(SPOT=SPOT)
sio.savemat('data_dump.mat', matlab_data)

data_dump.mat is Matlab data. For more detail, see http://docs.scipy.org/doc/scipy/reference/tutorial/io.html

answered Jul 1, 2014 at 5:25

emesday

6,2063 gold badges31 silver badges46 bronze badges

Comments

Marcin · Accepted Answer · 2014-07-01 05:26:25Z

1

If you have scipy than you can do:

import scipy.io
scipy.io.savemat('/tmp/test.mat', dict(SPOT=SPOT))

And in matlab:

a=load('/tmp/test.mat');
a.SPOT % should have your data

answered Jul 1, 2014 at 5:26

Marcin

241k16 gold badges315 silver badges368 bronze badges

Comments

user3792245 · Accepted Answer · 2014-07-02 04:49:43Z

0

Thanks everyone and thanks @CT Zhu for letting me know!

Since I am not using Scipy, I tried using np.savetxt and it seems to work! Added the following and it writes into a format that is readable in Matlab as an array directly. Thanks again!

np.savetxt('test.txt', SPOT, fmt = '%10.5f', delimiter=',', newline = ';\n', header='data =[...', footer=']', comments = '#')

Cheers! Sree.

answered Jul 2, 2014 at 4:49

user3792245

8287 silver badges10 bronze badges

Collectives™ on Stack Overflow

Python output readable in Matlab

4 Answers 4

1 Comment

Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

4 Answers 4

1 Comment

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related