[英]How do I get all bars in a matplotlib bar chart?
It is easy to retrieve all lines in a line chart by calling the get_lines()
function.通过调用get_lines()
函数可以轻松检索折线图中的所有线条。 I cannot seem to find an equivalent function for a barchart, that is retrieving all Rectangle instances in the AxesSubplot
.我似乎无法找到一个条形图同等功能,即检索所有矩形实例在AxesSubplot
。 Suggestions?建议?
If you want all bars, just capture the output from the plotting method.如果您想要所有条形,只需捕获绘图方法的输出。 Its a list containing the bars:它是一个包含栏的列表:
import numpy as np
import matplotlib as mpl
import matplotlib.pyplot as plt
fig, ax = plt.subplots()
x = np.arange(5)
y = np.random.rand(5)
bars = ax.bar(x, y, color='grey')
bars[3].set_color('g')
If you do want all Rectangle object in the axes, but these can be more then just bars, use:如果您确实需要坐标区中的所有 Rectangle 对象,但这些对象可能不仅仅是条形,请使用:
bars = [rect for rect in ax.get_children() if isinstance(rect, mpl.patches.Rectangle)]
Another option that might be useful to some people is to access ax.containers
.另一个可能对某些人有用的选项是访问ax.containers
。 You have to be a little careful though as if your plot contains other types of containers you'll get those back too.你必须小心一点,因为如果你的情节包含其他类型的容器,你也会得到它们。 To get just the bar containers something like只获得酒吧容器之类的东西
from matplotlib.container import BarContainer
bars = [i for i in ax.containers if isinstance(i, BarContainer)]
This can be pretty powerful with a few tricks (taking inspiration from the accepted example).这可以通过一些技巧非常强大(从公认的例子中获得灵感)。
import numpy as np
import matplotlib.pyplot as plt
fig, ax = plt.subplots()
x = np.arange(5)
y = np.random.rand(2, 5)
ax.bar(x, y[0], width=0.5)
ax.bar(x + 0.5, y[1], width=0.5)
for bar, color in zip(ax.containers, ("red", "green")):
# plt.setp sets a property on all elements of the container
plt.setp(bar, color=color)
will give you:会给你:
If you add some labels to your plots you can construct a dictionary of containers to access them by label如果您在绘图中添加一些标签,您可以构建一个容器字典以通过标签访问它们
import numpy as np
import matplotlib.pyplot as plt
fig, ax = plt.subplots()
x = np.arange(5)
y = np.random.rand(2, 5)
ax.bar(x, y[0], width=0.5)
ax.bar(x + 0.5, y[1], width=0.5, label='my bars')
named_bars = {i.get_label(): i for i in ax.containers}
plt.setp(named_bars["my bars"], color="magenta")
will give you会给你
Of course, you can still access an individual bar patch within a container eg当然,您仍然可以访问容器中的单个条形补丁,例如
import numpy as np
import matplotlib.pyplot as plt
fig, ax = plt.subplots()
x = np.arange(5)
y = np.random.rand(2, 5)
ax.bar(x, y[0], width=0.5)
ax.bar(x + 0.5, y[1], width=0.5)
plt.setp(ax.containers[0], color="black")
plt.setp(ax.containers[1], color="grey")
ax.containers[0][3].set_color("red")
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