Examples of integration of Python function drawing and advanced algebra (2): Flashpoint function
1: Comprehensive example of line graph
import matplotlib.pyplot as plt import numpy as np from pylab import mpl ''' Function: Add directional annotation text of graphic content details Call signature: plt.annotate("Maximum value of vertex", xy=(np.pi / 2, 1.0), weight="bold", color="r", arrowprops=dict(arrowstyle="->", connectionstyle="arc3", color="r")) Parameter Description: string: the content text of the graphic annotation xy: coordinate position of the annotated graphic content xytext: content coordinates of the annotation text weight: font weight style of annotation text color: font color of comment text arrowprops: A dictionary of properties for arrows indicating the annotated content ''' #Set Chinese display font mpl.rcParams["font.sans-serif"] = ["SimHei"] #Set normal display symbols mpl.rcParams["axes.unicode_minus"] = False x = np.linspace(0.05, 10, 1000) y = np.sin(x) plt.plot(x, y, ls="-.", lw=2, c="c", label="plot function draws sinusoidal graphics|annotate function adds directional annotation text for graphic content details") # Reference line perpendicular to the X|Y axis plt.axhline(y=0.0, c="r", ls="--", lw=1) plt.axvline(x=4.5, c="r", ls="--", lw=1) # Label text for X|Y axis plt.xlabel("X-axis coordinate axis") plt.ylabel("Y-axis coordinate axis") ''' Function: Text label legend to mark different graphics Call signature: plt.legend(loc="lower left") Parameter Description: loc: the geographical location of the legend in the picture That is, the display position of the label label in the plot() function ''' plt.legend(loc="lower left") #The annotate function adds directional annotation text for graphic content details plt.annotate("Maximum value of vertex", xy=(np.pi / 2, 1.0), weight="bold", color="r", arrowprops=dict(arrowstyle="->", connectionstyle="arc3", color="r")) ''' Function: Add undirected annotation text of graphic content details Call signature: plt.text(3.10, 0.09, "y=sin(x)", weight="bold", color="b") Parameter Description: x: x coordinate of the annotation text y: y coordinate of the annotation text string: the content of the comment weight: The thickness style of the annotation text content color: font color of the annotation text content ''' #Add non-directional annotation text of graphic content details plt.text(3.10, 0.09, "y=sin(x)", weight="bold", color="b") ''' Function: Add title of graphic content Call signature: plt.title("Sine function graph") Parameter Description: string: title text of graphic content ''' plt.title("Sine function graph") plt.show()
2: Comprehensive example operation effect of line graph
