Sensor Readings

Part of the Data and Plots section of Coddy's Machine Learning journey. Lesson 58 of 60.

A sensor logs a server room's temperature every hour, from hour 0 (midnight) to 23. When a reading fails, it writes -999 instead.

The technician wants each day summed up with the failures left out, and drawn like Monday's (day 1):

A line chart titled Server Room Temperature: from about 17 C at night, the line climbs to a peak of 29.4 C at hour 14, then falls back to 18 C by midnight

Above 25 C, the room needs attention.

Challenge

Hard

The starter holds four days of readings in week, one row per day, and reads a day number, 1 to 4.

Print how many of that day's readings failed.
Print the mean of the good readings, rounded to 1 decimal with np.round, and how many are above limit.
Print the warmest hour and its reading.
Draw the good readings against their hours with the fig, ax form, titled Server Room Temperature, labelled Hour and Temperature (C).

For day 1, the whole output is:

Failed readings: 3
Average: 21.9
Hours above 25: 7
Warmest: hour 14 at 29.4
Charts drawn: 1
Title: Server Room Temperature
X label: Hour
Y label: Temperature (C)
Lines: 1
Across (x): [0, 1, 2, 4, 5, 6, 7, 8, 9, 10, 12, 13, 14, 15, 16, 17, 18, 20, 21, 22, 23]
Up (y): [17.2, 16.8, 16.5, 16.1, 16.4, 17.9, 19.6, 21.8, 23.5, 25.1, 27.9, 28.8, 29.4, 28.7, 27.2, 25.6, 23.9, 21, 19.8, 18.6, 17.9]

Try it yourself

import numpy as np
import matplotlib.pyplot as plt

# Server room temperature (C) at hours 0 to 23, one row per day; -999 means the reading failed
week = np.array([
    [17.2, 16.8, 16.5, -999, 16.1, 16.4, 17.9, 19.6, 21.8, 23.5, 25.1, -999,
     27.9, 28.8, 29.4, 28.7, 27.2, 25.6, 23.9, -999, 21.0, 19.8, 18.6, 17.9],
    [-999, 17.4, 17.0, 16.7, 16.6, 17.0, 18.2, 19.9, 21.5, -999, 24.6, 26.0,
     27.1, 27.8, 28.0, 28.3, 26.4, -999, 23.1, 21.7, 20.5, 19.4, 18.8, 18.1],
    [18.3, 18.0, 17.8, 17.5, 17.6, -999, -999, 20.4, 22.9, 25.3, 27.6, 29.5,
     31.0, 32.2, 32.9, 33.1, 32.4, 30.8, 28.7, 26.5, 24.6, 22.8, 21.3, 20.1],
    [16.9, 16.5, 16.2, 16.0, 15.8, 16.1, 16.9, 18.0, 19.4, 20.8, 22.3, 23.6,
     24.7, 26.2, 25.8, 25.1, 24.0, 22.6, 21.3, 20.2, 19.3, 18.5, 17.8, -999],
])
day = int(input())
limit = 25

# Write your code below