修复ggplot中facet中的数据顺序

我在用ggplot绘制数据时遇到了问题 . 我无法使每个方面内的数据正确排序 . 我的样本数据是：

data <- structure(list(Parameter = c("{0.1, 0.7, 0.0, 0.2}", "{0.2, 0.7, 0.0, 0.1}", 
"{0.3, 0.7, 0.0, 0.0}", "{0.0, 0.7, 0.0, 0.3}", "{0.0, 0.6, 0.0, 0.4}", 
"{0.1, 0.6, 0.0, 0.3}", "{0.2, 0.6, 0.0, 0.2}", "{0.3, 0.6, 0.0, 0.1}", 
"{0.4, 0.6, 0.0, 0.0}", "{0.1, 0.3, 0.2, 0.4}", "{0.1, 0.7, 0.0, 0.2}", 
"{0.2, 0.7, 0.0, 0.1}", "{0.3, 0.7, 0.0, 0.0}", "{0.0, 0.7, 0.0, 0.3}", 
"{0.1, 0.3, 0.2, 0.4}", "{0.1, 0.5, 0.1, 0.3}", "{0.2, 0.5, 0.1, 0.2}", 
"{0.3, 0.3, 0.2, 0.2}", "{0.4, 0.3, 0.2, 0.1}", "{0.5, 0.3, 0.2, 0.0}", 
"{0.1, 0.6, 0.0, 0.3}", "{0.2, 0.6, 0.0, 0.2}", "{0.4, 0.6, 0.0, 0.0}", 
"{0.3, 0.6, 0.0, 0.1}", "{0.0, 0.6, 0.0, 0.4}", "{0.1, 0.7, 0.0, 0.2}", 
"{0.2, 0.7, 0.0, 0.1}", "{0.3, 0.7, 0.0, 0.0}", "{0.0, 0.7, 0.0, 0.3}", 
"{0.1, 0.4, 0.1, 0.4}"), Map = c(0.19608779, 0.19608779, 0.19581, 
0.19490847, 0.18973944, 0.18943608, 0.18943608, 0.18915829, 0.18915829, 
0.18856215, 0.20025444, 0.20025444, 0.19997665, 0.19907513, 0.19272882, 
0.19250154, 0.19250154, 0.19249977, 0.19249977, 0.19249977, 0.19608779, 
0.19608779, 0.19585875, 0.19581, 0.1952106, 0.19046278, 0.19046278, 
0.19023374, 0.18928346, 0.18833488), Sigma = c("Sigma = 370", 
"Sigma = 370", "Sigma = 370", "Sigma = 370", "Sigma = 370", "Sigma = 370", 
"Sigma = 370", "Sigma = 370", "Sigma = 370", "Sigma = 370", "Sigma = 380", 
"Sigma = 380", "Sigma = 380", "Sigma = 380", "Sigma = 380", "Sigma = 380", 
"Sigma = 380", "Sigma = 380", "Sigma = 380", "Sigma = 380", "Sigma = 390", 
"Sigma = 390", "Sigma = 390", "Sigma = 390", "Sigma = 390", "Sigma = 390", 
"Sigma = 390", "Sigma = 390", "Sigma = 390", "Sigma = 390")), .Names = c("Parameter", 
"Map", "Sigma"), class = "data.frame", row.names = c(NA, -30L
))


data
              Parameter       Map       Sigma
1  {0.1, 0.7, 0.0, 0.2} 0.1960878 Sigma = 370
2  {0.2, 0.7, 0.0, 0.1} 0.1960878 Sigma = 370
3  {0.3, 0.7, 0.0, 0.0} 0.1958100 Sigma = 370
4  {0.0, 0.7, 0.0, 0.3} 0.1949085 Sigma = 370
5  {0.0, 0.6, 0.0, 0.4} 0.1897394 Sigma = 370
6  {0.1, 0.6, 0.0, 0.3} 0.1894361 Sigma = 370
7  {0.2, 0.6, 0.0, 0.2} 0.1894361 Sigma = 370
8  {0.3, 0.6, 0.0, 0.1} 0.1891583 Sigma = 370
9  {0.4, 0.6, 0.0, 0.0} 0.1891583 Sigma = 370
10 {0.1, 0.3, 0.2, 0.4} 0.1885622 Sigma = 370
11 {0.1, 0.7, 0.0, 0.2} 0.2002544 Sigma = 380
12 {0.2, 0.7, 0.0, 0.1} 0.2002544 Sigma = 380
13 {0.3, 0.7, 0.0, 0.0} 0.1999767 Sigma = 380
14 {0.0, 0.7, 0.0, 0.3} 0.1990751 Sigma = 380
15 {0.1, 0.3, 0.2, 0.4} 0.1927288 Sigma = 380
16 {0.1, 0.5, 0.1, 0.3} 0.1925015 Sigma = 380
17 {0.2, 0.5, 0.1, 0.2} 0.1925015 Sigma = 380
18 {0.3, 0.3, 0.2, 0.2} 0.1924998 Sigma = 380
19 {0.4, 0.3, 0.2, 0.1} 0.1924998 Sigma = 380
20 {0.5, 0.3, 0.2, 0.0} 0.1924998 Sigma = 380
21 {0.1, 0.6, 0.0, 0.3} 0.1960878 Sigma = 390
22 {0.2, 0.6, 0.0, 0.2} 0.1960878 Sigma = 390
23 {0.4, 0.6, 0.0, 0.0} 0.1958587 Sigma = 390
24 {0.3, 0.6, 0.0, 0.1} 0.1958100 Sigma = 390
25 {0.0, 0.6, 0.0, 0.4} 0.1952106 Sigma = 390
26 {0.1, 0.7, 0.0, 0.2} 0.1904628 Sigma = 390
27 {0.2, 0.7, 0.0, 0.1} 0.1904628 Sigma = 390
28 {0.3, 0.7, 0.0, 0.0} 0.1902337 Sigma = 390
29 {0.0, 0.7, 0.0, 0.3} 0.1892835 Sigma = 390
30 {0.1, 0.4, 0.1, 0.4} 0.1883349 Sigma = 390

这是我的R代码：

ggplot (data, aes(x=Map, y=reorder(Parameter, Map))) +
  geom_segment(aes(yend=Parameter), xend=0, colour="grey50") + 
  geom_point(size=3) + xlab("") +     ylab("") +     
  facet_grid(Sigma ~ ., scales="free_y", space="free_y")+ 
  theme(axis.text.x=element_text(angle = -70, hjust = 0))+
  scale_x_continuous(breaks =Br,expand = waiver())

给我以下情节：

正如您可以在每个方面内看到的那样，数据没有以正确的方式排序 . 很感谢任何形式的帮助 .