python

ax = plt.gca()
plt.text(0.1,0.2, "text", fontsize = 20, transform = ax.transAxes)

matlab

方法1

text( 'string',"(a) UB-OR", 'Units','normalized','position',[0.75,0.95]);  

方法2

text( 0.75，0.95,"(a) UB-OR", "sc");