Trying to plot UV-index over the course of the day. The data comes from an api, which after some treatment gives me the data in a nice list. The plot however is absolutely disgusting. Link to graph. Y-axis values are repeated and thrown around, so there are multiple 0s, positive numbers on both sides of the multiple 0s, and a nightmare to interpret. Thanks in advance
Code:
import requests
import re
from matplotlib import pyplot as plt
import numpy as np
# Get weather information
response = requests.get("https://api.openweathermap.org/data/2.5/onecall?lat=55.583328&lon=13.0&lang=se&exclude=minutely,daily,alerts&units=metric&appid=0f0212703cfecb4699dfc2c7edde950a")
# Save weather information to file
with open("weather.csv", 'w') as file:
file.write(response.text)
# Opens the file and gets all the values of "uv-index"
with open("Weather.csv", 'r') as text:
pattern = 'uvi":(.*?),'
Line = text.read()
substring = np.array(re.findall(pattern, Line))
# Creates an x-axis as a list with the same size as y-axis
# If they're not the same size, error is given:
# ValueError: x and y must have same first dimension, but have shapes (12,) and (49,)
x_axis = []
for i in range(len(substring)):
x_axis.append(i)
x_axis = np.array(x_axis)
# Determines size and plots graph
fig, ax = plt.subplots(figsize=(10, 6))
ax.plot(x_axis, substring)
# Creates labels
plt.title("UV-Index today")
plt.xlabel("Time")
plt.ylabel("UV-Index")
# Saves the plot as image and shows it on screen
plt.savefig("UV-Index" + ".png")
plt.show()
Your substring is a list of strings. Matplotlib treats strings as discrete values (so there's no difference in distance between '0' and '0.01' and '0' and '1000'; and there's no order between them, so '1000' could appear lower than '0').
Convert your substring to float before plotting:
substring = list(map(float,substring))
Or, since your substring is a numpy array:
substring = substring.astype('float')