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gmarsi
Asked: 2020-08-15 06:59:43 +0800 CST 2020-08-15 06:59:43 +0800 CST

Indicate data in bar graph with matplotlib

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

enter image description here

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

enter image description here

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

enter image description here

python

1 Answers

  1. Best Answer

    You can also use matplotlib.pyplot.textor matplotlib.pyplot.annotateto add the text you want above each column.

    I'm assuming your data is in a Pandas DataFrame, so you can use it pandas.DataFrame.plot.barto make it easy to create the chart from it, although the idea is the same if used matplotlib.pyplot.bardirectly.

    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()

    enter image description here

    Since you apparently represent the time as an integer, I've simply used string literal formatting f"{visitsPerDay['Hora'][i]}:00"to assign the corresponding string to each slash, if you're using Python < 3.6 you can use "{}:00".format(visitsPerDay['Hora'][i]).

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