如何在R中组合两个等价图（晶格）？

Question

我想为下面的点阵图形添加两个等价图。 plot()函数par(mfcol=c(1,2))的常用技巧不适用于这些基于点阵的图形。我看了相关的帖子，虽然我似乎无法从解决方案中提取我需要的信息。如何组合以下等效图，使它们在输出中相邻（并排）？或者，换句话说，等于par(mfcol=c(1,2))的格子是什么？

require(equivalence)

# Simplified data for equivalence plot 1
a = c(2,4,6,8,10,12,14,16,18)
b = c(1,3,5,7,9,11,13,15,17)
mydata1 = data.frame(a,b)

equivalence.xyplot(mydata1$b ~ mydata1$a,
                   alpha=0.05, b0.ii=0.25, b1.ii=0.25)


# Simplified data for equivalence plot 2
x = c(1,4,8,2,3,4,6,5,9)
y = c(2,4,7,3,3,4,7,5,9)
mydata2 = data.frame(x,y)

equivalence.xyplot(mydata2$y ~ mydata2$x,
                   alpha=0.05, b0.ii=0.25, b1.ii=0.25)

Answer 1

根据@mplourde评论中的link，代码的以下更改将图表排列到我的规格中：

require(equivalence)

# Simplified data for equivalence plot 1
a = c(2,4,6,8,10,12,14,16,18)
b = c(1,3,5,7,9,11,13,15,17)
mydata1 = data.frame(a,b)

px1 = equivalence.xyplot(mydata1$b ~ mydata1$a,
                   alpha=0.05, b0.ii=0.25, b1.ii=0.25)

# Simplified data for equivalence plot 2
x = c(1,4,8,2,3,4,6,5,9)
y = c(2,4,7,3,3,4,7,5,9)
mydata2 = data.frame(x,y)

px2 = equivalence.xyplot(mydata2$y ~ mydata2$x,
                   alpha=0.05, b0.ii=0.25, b1.ii=0.25)

print(px1, position=c(0, 0.5, .5, 1), more=TRUE)
print(px2, position=c(0.5, 0.5, 1, 1))