![]() # second annotation relative to the axis limits bbox_props = dict ( boxstyle = "round,pad=0.5", fc = "w", ec = "k", lw = 2 )Īx. annotate ( 'function minium \n relative to data', xy = ( 0, 0 ), xycoords = 'data', xytext = ( 2, 3 ), arrowprops = dict ( facecolor = 'black', shrink = 0.05 ), horizontalalignment = 'left', verticalalignment = 'top' ) # first annotation relative to the data ax. Import numpy as np import matplotlib.pyplot as plt # if using a Jupyter notebook, include: % matplotlib inline The next code section builds a figure with three annotation arrows. ax.annotate() keywordĪnnotation location relative to figure windowĭefine bounding box properties with a dictionaryĭefine arrow properties with a dictionary The chart below summarizes Matplotlib's ax.annotate() keyword arguments. Since xy=(20, 75), the third annotation arrow points 20 pixels to the right and 75 pixels up from the bottom left corner of the figure window. This means the third annotation is placed relative to the figure window. In the third annotation, xycoords='figure pixels'. Since xy=(0, 0.5), the annotation arrow points all the way to the left edge of the x-axis and half way up the y-axis. This means the second annotation is placed relative to the axis. In the second annotation, xycoords='axes fraction'. Since xy=(0, 0), the annotation arrow points to the data point 0,0. This means the annotation is placed relative to the data. In the first annotation, xycoords='data'. ![]() The annotation can be located relative to the plot data, located relative to the axis, or located relative to the figure window. Each of the three annotations in the next figure has a different xycoords= keyword argument. The keyword argument to pay attention to in the next code section is xycoords=. ax.annotate('text', xy=, xycoodrs=, xytext=, arrowprops= ) Multiple keyword arguments can be passed to ax.annotate() method to specify the annotation location and style the annotation. Matplotlib's ax.annotate() method creates the annotations. The code section below builds a simple line plot and applies three annotations (three arrows with text) on the plot. Text can be included on a plot to indicate a point of interest or highlight a specific feature of a plot. Sometimes it is useful for problem solvers to annotate plots. Problem Solving with Python Book Construction
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