Question

我使用xyplot()中的Lattice来绘制由3列数据框定义的箭头：posi（数字），从（字符）到（字符）。问题：有时，箭头超出了绘图的范围。换句话说，绘图窗口不够大，无法显示所有数据。

我尝试明确添加因子水平，但无济于事。似乎如果更多的极端水平（例如＆＃34; D＆＃34;）不存在于因子＆＃34; df $来自＆＃34;，那些不计算绘制绘图窗口。我查看ylim但这仅限于数值。

我已经环顾四周了，并且发现了很多关于重新缩放，重新排序轴但没有任何帮助我解决手头问题的事情。这个问题与@skan的一个问题有关：How to plot segments or arrows in Lattice。

我的数据：

l <- c("A", "B", "C", "D")
df <- data.frame(posi = c(1, 2, 3, 4, 5), 
                 from = factor(c("A", "B", "C", "D", "A"), levels = l, ordered = TRUE),
                 to = factor(c("C", "D", "D", "C", "A"), levels = l, ordered = TRUE)
)

这是预期的情节：

xyplot(from ~ posi , type="p", col="black",  data=df, pch=16, xlim = c(0,7), 
       panel = function(...){
         panel.dotplot(x = df$posi, y = df$from, col ="green", cex=1.6)
         panel.dotplot(x = (df$posi+1), y = df$to, col="black", cex=1.)
         panel.arrows(x0 = df$posi, y0 = df$from, x1 = df$posi+1, y1 = df$to, lwd=2, col="blue" )
       }
)

当我只使用前三行时，相同的数据框与'＃39; old＆＃39;因子水平完整，该情节没有考虑到后来的＆＃34; D＆＃34;需要水平。

## only first 3 rows, without element "D" in the factor df$from
df <- df[1:3, ]

导致这个情节：

我希望能够设置Y轴的限制，并希望得到任何帮助或提示。

Answer 1

通过在调用xyplot中指定“drop.unused.levels = FALSE”可以避免这个问题。

library(lattice)

l <- c("A", "B", "C", "D")
df <- data.frame(posi = c(1, 2, 3, 4, 5), 
             from = factor(c("A", "B", "C", "D", "A"), levels = l, 
                           ordered = TRUE),
             to = factor(c("C", "D", "D", "C", "A"), levels = l, 
                         ordered = TRUE))


xyplot(from ~ posi , type="p", col="black",  data=df, pch=16, xlim = c(0,7), 
   panel = function(...){
     panel.dotplot(x = df$posi, y = df$from, col ="green", cex=1.6)
     panel.dotplot(x = (df$posi+1), y = df$to, col="black", cex=1.)
     panel.arrows(x0 = df$posi, y0 = df$from, x1 = df$posi+1, y1 = df$to, 
                  lwd=2, col="blue" )
   })

df2 <- df[1:3,]
xyplot(from ~ posi , type="p", col="black",  data=df2, pch=16, xlim = c(0,7), 
   drop.unused.levels = FALSE,
   panel = function(...){
     panel.dotplot(x = df2$posi, y = df2$from, col ="green", cex=1.6)
     panel.dotplot(x = (df2$posi+1), y = df2$to, col="black", cex=1.)
     panel.arrows(x0 = df2$posi, y0 = df2$from, x1 = df2$posi+1, 
                  y1 = df2$to, lwd=2, col="blue" )
   })

Lattice xyplot不显示Y轴上的所有因子级别：不完整的图

1 个答案: