我目前有三个正弦函数（y1、y2、y3），并且希望在新函数（ytotal）中对函数的输出求和，但仅限于正弦函数的输出大于 0 的情况。import numpy as npimport matplotlib.pyplot as plt#%%phi = np.linspace(-2*np.pi, 2*np.pi, 100)y1 = 0.2*np.sin(phi)y2 = 0.2*np.sin(phi-(120*(np.pi/180)))y3 = 0.2*np.sin(phi-(240*(np.pi/180)))#if y1 or y2 or y3 > 0:#    ytotal = y1+y2+y3    plt.plot(phi,y1, label = "Piston 1")plt.plot(phi,y2, label = "Piston 2")plt.plot(phi,y3, label = "Piston 3")#plt.plot(phi,ytotal, label = "Total output")positions = (0,np.pi/3,2*np.pi/3,np.pi,4*np.pi/3,5*np.pi/3,2*np.pi)labels = ("0","60","120","180","240","300","360")plt.xticks(positions, labels)plt.xlabel('Angular displacement')plt.ylabel('Stroke')plt.legend()plt.show()输出应类似于以下内容：