Matplotlib.axes.Axes.boxplot() in Python - GeeksforGeeks

13 Apr, 2020
Matplotlib is a library in Python and it is numerical – mathematical extension for NumPy library. Axes Class contains most of the figure elements: Axis, Tick, Line2D, Text, Polygon, etc., and sets the coordinate system. And the instances of Axes supports callbacks through a callbacks attribute.
The Axes.boxplot() function in axes module of matplotlib library is used to make a box and whisker plot for each column of x or each vector in sequence x.
Syntax: Axes.boxplot(self, x, notch=None, sym=None, vert=None, whis=None, positions=None, widths=None, patch_artist=None, bootstrap=None, usermedians=None, conf_intervals=None, meanline=None, showmeans=None, showcaps=None, showbox=None, showfliers=None, boxprops=None, labels=None, flierprops=None, medianprops=None, meanprops=None, capprops=None, whiskerprops=None, manage_ticks=True, autorange=False, zorder=None, *, data=None)
Parameters: This method accept the following parameters that are described below:
x: This parameter is a sequence of data.
notch: This parameter will produce a notched box plot if true. Otherwise, a rectangular boxplot is produced.
sym : This parameter is an optional parameter and contain string value. It is a default symbol for flier points.
vert: This parameter is an optional parameter and contain boolean value. It makes the boxes vertical if true.Otherwise horizontal.
whis : This parameter determines the reach of the whiskers to the beyond the first and third quartiles.
bootstrap : This parameter is also an optional parameter which contain boolean value and specifies whether to bootstrap the confidence intervals around the median for notched boxplots.
usermedians : This parameter is an array or sequence whose first dimension is compatible with x.
conf_intervals : This parameter is also an array or sequence whose first dimension is compatible with x and whose second dimension is 2
positions : This parameter is used to sets the positions of the boxes.
widths: This parameter is used to sets the width of each box either with a scalar or a sequence.
patch_artist : This parameter is used to produce boxes with the Line2D artist if it is false. Otherwise, boxes with Patch artists.
labels : This parameter is the labels for each dataset.
manage_ticks : This parameter is used to adjust the tick locations and labels.
zorder : This parameter is used to sets the zorder of the boxplot.
Returns: This returns the following:
result :This returns the dictionary which maps each component of the boxplot to a list of the matplotlib.lines.Line2D.
Below examples illustrate the matplotlib.axes.Axes.boxplot() function in matplotlib.axes:
Example-1:
# Implementation of matplotlib functionimport numpy as npimport matplotlib.pyplot as plt   np.random.seed(10**7)  val1 = np.random.rand(50) * 80val2 = np.ones(80) * 50val3 = np.random.rand(50) * 80 + 100val4 = np.random.rand(50) * -80data = np.concatenate((val1, val2, val3, val4))  fig1, ax1 = plt.subplots()ax1.boxplot(data)   ax1.set_title('matplotlib.axes.Axes.boxplot() Example')plt.show()
Output:
Example-2:
# Implementation of matplotlib functionimport numpy as npimport matplotlib.pyplot as plt   np.random.seed(10**7)  val1 = np.random.rand(50) * 80val2 = np.ones(25) * 80val3 = np.random.rand(25) * 80 + 100val4 = np.random.rand(25) * -80data = np.concatenate((val1, val2, val3, val4))data1 = np.concatenate((val2, val4, val1, val3))data = [data, data1]  fig1, ax1 = plt.subplots()ax1.boxplot(data, notch = True, vert = False, whis = 0.75)   ax1.set_title('matplotlib.axes.Axes.boxplot() Example')plt.show()
Output:
Python-matplotlib
Python
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