使用 collapse_row 和 kable 时，如何解决 pdf 文档中长 table 的 alignment/display 问题？

Question

我必须生成具有相当长 table 的数据列表，这些列表必须显示在多个页面上，并且我想折叠一些行（例如：ID）。

我正在使用包 kable 生成 table 和 collapse_row 函数来折叠我的 ID 行。

当我编织成 pdf 时，列中折叠行的对齐方式完全混乱，我什至让 ID 出现在 table 之外或重复出现 header.. .

这是我的代码：

kable(data, "latex", booktabs = T,longtable = T, linesep = "", row.names = FALSE) %>%
kable_styling(full_width = T,
              position = "center",
              latex_options = c("striped", "repeat_header","hold_position"),
              font_size = 6,5)%>%
  column_spec(c(1),  color = "black", width = "5em")%>%
  column_spec(c(2), color = "black", width = "30em")%>%
  collapse_rows(1, latex_hline = "custom",valign = "top")%>%
  row_spec(0, bold = T, color = "black")

这是我的 pdf 输出的一部分：

线条很好，但 ID 移到了顶部。

我该如何解决这个问题？谢谢。

Answer 1

看起来像是表格中垂直对齐的 LaTeX 问题。

引自 github 上的问题：

[...]it seems like booktabs' cmidrule messed up the multirow's calculation..

[...] I don't know if I can find a good solution for this. I can certainly remove those midlines. I don't like them either but they are important for tables with multiple header columns. If we keep those midlines, TeX people say you can manually add adjustments to multirow. I can certainly simulate it via code but it seems like it will bring me more issues in the future.

来源：https://github.com/haozhu233/kableExtra/issues/56

其他参考资料：

This solution worked well in my case when I had the same problem. The solution is based on manipulating the data.frame before outputting to kable rather than changing the kable output with collapse_rows. The original contributor (Michael Harper) 开发它是为了与 formattable 包一起使用，但它可以很容易地针对 kable 包进行调整。

您需要声明此函数：

collapse_rows_df <- function(df, variable){

group_var <- enquo(variable)

  df %>%
    group_by(!! group_var) %>%
    mutate(groupRow = 1:n()) %>%
    ungroup() %>%
    mutate(!!quo_name(group_var) := ifelse(groupRow == 1, as.character(!! group_var), "")) %>%
    select(-c(groupRow))
}

该函数去除指定列中除第一次遇到的数据以外的所有数据，而是保留空格。

您需要在将数据发送到kable 之前调用该函数。请参阅以下示例：

library(knitr) # required for kable()

# dfToKable - your data.frame you need to kable
# columnToCollapseRows - the name of the column, in which you want to collapse the rows; 
#   it should be a valid variable within the data.frame set and be passed without quotes

kable( collapse_rows_df( dfToKable, columnToCollapseRows ),
      row.names = F, escape = F, longtable = TRUE) %>% 
      kable_styling(full_width = T, latex_options = c("repeat_header"))

根据您提供的代码和屏幕截图，这应该适合您：

kable( collapse_rows_df( data, SubID) "latex", booktabs = T,longtable = T, linesep = "", row.names = FALSE) %>%
kable_styling(full_width = T,
              position = "center",
              latex_options = c("striped", "repeat_header","hold_position"),
              font_size = 6,5)%>%
  column_spec(c(1),  color = "black", width = "5em")%>%
  column_spec(c(2), color = "black", width = "30em")%>%
  row_spec(0, bold = T, color = "black")

使用 collapse_row 和 kable 时，如何解决 pdf 文档中长 table 的 alignment/display 问题？

How to fix alignment/display problems of a long table in a pdf document when using collapse_row and kable?

pdf

r

longtable

kable