Check if a comma is added
Recently, when drawing, I encountered such a problem. When I used matplotlib to add a legend to the curve, I found that only a transparent box was displayed, and the text added with the annotation was not displayed as expected.
After investigation, the problematic part of the code is here:
# time domain
L1 = plt.plot(tt,data_shaped[0],'r')
L2 = plt.plot(tt,data_shaped[1],'b')
L3 = plt.plot(tt,data_shaped[2],'g')
# legend
plt.legend([L1, L2, L3],['Tx-Rx1', 'Tx-Rx2', 'Tx-Rx3'],loc = 'upper right')
The solution is: add a comma after the three curve objects L1, L2, L3
i.e. modified to
# time domain
L1, = plt.plot(tt,data_shaped[0],'r')
L2, = plt.plot(tt,data_shaped[1],'b')
L3, = plt.plot(tt,data_shaped[2],'g')
The transparent frame disappears and the annotation text is displayed normally
Pay attention to setting the Chinese environment
Add another problem that I have encountered before, that is, it is not possible to directly add Chinese annotations, and Chinese will only be displayed in the form of thick lines .
# time domain
L1, = plt.plot(tt,data_shaped[0],'r')
L2, = plt.plot(tt,data_shaped[1],'b')
L3, = plt.plot(tt,data_shaped[2],'g')
# legend
plt.legend([L1, L2, L3],['接收天线1', '接收天线2', '接受天线3'],loc = 'upper right')
This is because matplotlib does not support Chinese by default, and the Chinese environment needs to be set at the beginning . i.e. at the beginning add new
import pylab as mpl
# 设置中文显示字体，因为matplotlib默认不支持中文
mpl.rcParams['font.sans-serif'] = ['FangSong'] # 指定默认字体为仿宋
After that, it will be displayed normally: