小编vpz*_*vpz的帖子

我有四个单独的饼图，它们都具有相同的指定配色方案（除了数据框之外，代码是相同的）。

指定颜色是因为我想将它们在 4 个网格图中与一个图例组合在一起，为 5 组中的每一组使用相同的指定颜色（即，当未指定颜色时，颜色会根据大小自动分配）团体）。

示例数据：

# Data
g = c("D","L","X","A","N","B")
v = c(49,14,9,7,6,5)

df1 = data.frame(group = g, value = v)
set.seed(9) # Just for reproductibility
df2 = data.frame(group = sample(g,size = nrow(df1),replace = F),
                 value = sample(v,size = nrow(df1),replace = F)
                 )

set.seed(8) 
df3 = data.frame(group = sample(g,size = nrow(df1),replace = F),
                 value = sample(v,size = nrow(df1),replace = F)
)

set.seed(7)
df4 = data.frame(group = sample(g,size = nrow(df1),replace = F),
                 value = sample(v,size = nrow(df1),replace = F) …

当我导入 csv 时，它显示为具有这种格式的数据框

firstcol <- c("A","","D","Z")
seccol <- c("W","Y","C","")
thircol <- c("","H","Q","M")

df <- data.frame(firstcol,seccol,thircol)

#    > df
#      firstcol seccol thircol
#    1        A      W        
#    2               Y       H
#    3        D      C       Q
#    4        Z              M

当我打字 levels(df$firstcol)

输出是： [1] "" "A" "D" "Z"

如何导入我的 csv 以便将单元格读取为空单元格而不是作为观察值？