Indicate data in bar graph with matplotlib

Question

Indicate data in bar graph with matplotlib

Navigation

#1 by (1 votes)

1

I am working with a table that indicates the number of the day, the time of day and a number of visits

And I want to create a bar graph that indicates the number of visits per hour (like the one in the image)

But, how can I also indicate the hours in each bar? Something similar to this I've done with paint, but at all times, of course.

python matplotlib graficas

asked by gmarsi 14.08.2018 в 16:59

source

1 answer

Datetimepicker javascript Receive a response in php and define it in android studio

score 1 · Accepted Answer

You can use matplotlib.pyplot.text or matplotlib.pyplot.annotate to add the text you want on each column.

I guess your data is in a Pandas DataFrame, so you can use pandas.DataFrame.plot.bar to facilitate the creation of the graphic from it, although the idea is the same if matplotlib.pyplot.bar is used directly.

import pandas as pd
import matplotlib.pyplot as plt



data = {"Dia": (14, 14, 14, 12, 12, 12, 12, 12),
        "Hora": (16, 14, 13, 12, 23, 22, 21, 20),
        "Visita": (5, 2, 6, 19, 8, 47, 13, 51)}

visitsPerDay = pd.DataFrame(data)
ax = visitsPerDay.plot.bar("Dia", "Visita")

for i, bar in enumerate(ax.patches):
    ax.text(bar.get_x() + bar.get_width() / 2, bar.get_height() + 1.5,
            f"{visitsPerDay['Hora'][i]}:00",
            horizontalalignment= 'center', verticalalignment='bottom',
            fontsize=10, rotation=90, color='dimgrey')

ax.set_xlabel("Número del dia")
ax.set_ylabel("Visitas")
ax.margins(x=0, y=0.3)

plt.show()

Since apparently the time is represented as an integer, I used simply chain literals format f"{visitsPerDay['Hora'][i]}:00" to assign the corresponding string to each bar, if you use Python < 3.6 you can use "{}:00".format(visitsPerDay['Hora'][i]) .