[Python] Matplotlib - A Simple Plot

# Define the encoding of this script (unicode)
# -*- coding: utf-8 -*-

# Importing the module numpy, and renaming it np
import numpy as np

# Importing the module matplotlib.pyplot, and renaming it plt
import matplotlib.pyplot as plt



# Loads data from file into variables
# One variable for each column, this is possible thanks to unpack=True
# It is important that the number of columns corresponds with the number of variables
# Note that we use skiprows=1, this is because the top row is a header
# NOTE! You can download the file example_data.txt from the following URL:
# folk.ntnu.no/evenjc/python/example_data.txt
Pa, C, Rh, NH3, CO, NO2 = np.loadtxt('example_data.txt', unpack=True, skiprows=1)

# Plotting NH3, with the name "NH3", pink color, and a line  width of 5 points
plt.plot(NH3, label="NH3", color="pink", lineWidth=5)

# Plotting CO without a name, with standard color and line width. Matplotlib will chose colors
plt.plot(CO)


# Places a legend. 8 is center  bottom. Legend uses the label-data. See NH3 plot
# Do a google search for "matplotlib legend" for alternative placements
# If loc = 8 is removed, matplotlib will try to find the most suitable location
plt.legend(loc=8)

# Add grid to plot window
plt.grid()

# Redefine the bounds of your plot
plt.ylim(10, 30)
plt.xlim(0, 20)

# Show plot
plt.show()

# If you want to save your figure to file, use savefig instead of show.
# https://matplotlib.org/3.1.1/api/_as_gen/matplotlib.pyplot.savefig.html