我正在尝试使用xyplot函数绘制图形，但是没有输出

Question

每个人我都试图使用xyplot函数绘制图形。代码运行  没有任何输出。任何人都可以就如何克服这一挑战提供帮助或建议。

print(xyplot(ASEggerTest ~ rho, data = res, groups = tau))
print(xyplot(ASEggerTest ~ rho, data = res, groups = Odds))
print(xyplot(ASEggerTest ~ rho, data = res, groups = p))
print(xyplot(ASEggerModel, data = res, groups = rho))
print(xyplot(SchwarzerTest~ rho, data = res, groups = tau))
print(xyplot(SchwarzerTest ~ rho, data = res, groups = Odds))
print(xyplot(SchwarzerTest ~ rho, data = Fixed, groups = p))
print(xyplot(SchwarzerModel, data = res, groups = rho))

谢谢。