How to read data from txt file python
I have a python script which reads data from 4 txt files and stores the values in 4 numpy arrays. I put the txt files in the same directory with my python node, but when I run the node the files cannot be located and I get the error:
IOError: [Errno 2] No such file or directory: 'xdot.txt'
That works when I run the code on a python IDE, but I don't know where is the problem here. I am new to ROS and I use ROS Kinetic, Python 2.7.12 on Ubuntu 16.04 LTS. Thank you in advance.
#!/usr/bin/python
import rospy
import serial
import time
from std_msgs.msg import String
from decimal import Decimal
import numpy as np
from scipy.integrate import odeint, solve_ivp
import matplotlib.pyplot as plt
from scipy.interpolate import interp1d
xdot_list = []
ydot_list = []
xdotdot_list = []
ydotdot_list = []
with open('xdot.txt', 'r') as filehandle:
filecontents = filehandle.readlines()
for line in filecontents:
current_place = line[:-1]
xdot_list.append(current_place)
xdot = np.array(xdot_list, dtype=np.float32)
with open('ydot.txt', 'r') as filehandle:
filecontents = filehandle.readlines()
for line in filecontents:
current_place = line[:-1]
ydot_list.append(current_place)
ydot = np.array(ydot_list, dtype=np.float32)
with open('xdotdot.txt', 'r') as filehandle:
filecontents = filehandle.readlines()
for line in filecontents:
current_place = line[:-1]
xdotdot_list.append(current_place)
xdotdot = np.array(xdotdot_list, dtype=np.float32)
with open('ydotdot.txt', 'r') as filehandle:
filecontents = filehandle.readlines()
for line in filecontents:
current_place = line[:-1]
ydotdot_list.append(current_place)
ydotdot = np.array(ydotdot_list, dtype=np.float32)
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