Graf teiknað

Teiknum nú graf af gagnaskránni log_temps.log

import matplotlib.pyplot as plt
import numpy as np
import datetime
import math

filename = 'log_temps.log'

with open(filename) as f:
    content = f.readlines()
    f.close()

content = [x.strip().split("\t") for x in content]

# Define a starting time so that we can plot by total seconds since start:
datetime_begin = datetime.datetime.strptime(content[0][0], '%Y-%m-%d %H:%M:%S.%f')

# Process the data points:
X = np.array([((datetime.datetime.strptime(line[0], '%Y-%m-%d %H:%M:%S.%f')-datetime_begin).total_seconds()) for line in content])
Y = np.array([line[1] for line in content])

plt.plot(X,Y)
plt.show()

# Recalculate the y-values:
Y = np.array([math.log(float(line[1])) for line in content])
plt.plot(X,Y)
plt.show()

# Strip out the first 93 elements
X = np.delete(X,range(93))
Y = np.delete(Y,range(93))
plt.plot(X,Y)
plt.show()