matplotlib 如何可视化散点图和绘图

Question

I want to connect scatter by line and show legend.. So I use plt.plot and plt.scatter.. but plot and scatter have each legend and show duplication. I think only plot has legend information because I define plt.legend before plt.scatter...

1. Can you tell me nice method to connect scatter?

2. Can you tell me why scatter has legend??

`` `python```

for index in range(len(xvalue_list)):
 plt.plot(xvalue_list, yvalue_list)
 plt.legend(graph_legend_list[index], fontsize = '10', fancybox=True)
 plt.scatter(xvalue_list, yvalue_list)    
 plt.xlabel(xlabel)
 plt.ylabel(ylabel)
plt.show()

Answer 1

You are creating 4 legends, where each character of the desired label is mapped to one of the elements in the plot. This is clearly not useful. Instead, create one single legend.

for index in range(len(xvalue_list)):
    plt.plot(xvalue_list, yvalue_list, marker="o", label=graph_legend_list[index])

plt.xlabel(xlabel)
plt.ylabel(ylabel)
plt.legend(fontsize = '10', fancybox=True)
plt.show()