Plot CSV file(s) describing PID output.

plot_pid_csv.py

import matplotlib.pyplot as plt
from matplotlib import gridspec
import sys
import pandas as pd


paths = sys.argv.copy()
del paths[0]
count = len(paths)

gs = gridspec.GridSpec(count, 1)
last_ax = None

for i, path in enumerate(paths):
	df = pd.read_csv(path, error_bad_lines=False)

	time = df['times']
	target = df['target']
	positions = df['positions']

	ax = plt.subplot(gs[i], sharex=last_ax)
	ax.set_title(path)
	ax.set_xlabel('time (s)')
	ax.set_ylabel('ticks')
	line_targ, line_pos = ax.plot(time, target, 'b--', time, positions, 'g')

	ax.legend((line_targ, line_pos), ('target', 'position'), loc='lower right')
	last_ax = ax

plt.show()