gt表中多列的条件格式化

Question

这是我的第一篇文章，如果我搞砸了一些事情，我深表歉意。我正在尝试将条件格式应用于 gt 表的多个列（将示例 SampA、SampB 和 SampB 的结果与 Limit 进行比较）。在其中一个gt 示例和不同的堆栈溢出 Q的引导下，我成功地使用以下代码将其应用于单个列（变量）：

## Conditional Formatting of single column in gt table

samples = as_tibble(cbind("Chem"=c("Cd","Pb","Zn"),
                       "Limit"=c("0.005","0.05","0.007"),
                       "SampA" = c("0.001","0.15","0.003"),
                       "SampB" = c("0.002","0.04","0.005"),
                       "SampC" = c("0.009","0.23","0.03")))

gt(samples,rowname_col="Chem") %>% tab_style(
        style = list(
                cell_fill(color = "grey80"),
                cell_text(weight = "bold")
        ),
        locations = cells_body(
                columns = vars(SampA),
                rows = SampA >= Limit
        )
    )   %>% tab_spanner(
            label = "Samples",
            columns = vars(SampA,SampB,SampC))

但是，我没有成功地尝试将其扩展到多个列。我可以让“列”参数与“vars(SampA,SampB,SampC)”一起使用。将“行”参数保留为“SampA >= Limit”，格式设置“有效”，即 SampA >= Limit 的所有行在三个 Samp 列中突出显示，但这不是我想要的。运行下面的代码最终不会对任何列进行格式化。

        locations = cells_body(
                columns = vars(SampA,SampB,SampC),
                rows = vars(SampA,SampB,SampC) >= Limit
        )

我已经能够通过重复为每列定制的“style_tab()”来“暴力”我所追求的目标，但我知道必须有更好的方法来实现我的目标。帮助？

Answer 1

我知道这可能为时已晚，无法帮助您，但我能够通过定义一个函数来解决这个问题，该函数创建具有正确参数的 cells_body 调用列表。然后，该列表被传递到locations参数，并将指定的格式应用于所有选定的单元格。希望其他人发现这很有用！

library(gt)
samples = as_tibble(cbind("Chem"=c("Cd","Pb","Zn"),
                          "Limit"=c("0.005","0.05","0.007"),
                          "SampA" = c("0.001","0.15","0.003"),
                          "SampB" = c("0.002","0.04","0.005"),
                          "SampC" = c("0.009","0.23","0.03")))

builder <- function(x, Limit){cells_body(columns = !!sym(x), rows = !!sym(x) > Limit)}

gt(samples,rowname_col="Chem") %>% 
  tab_style(style = list(cell_fill(color = "grey80"), cell_text(weight = "bold")),
            locations = lapply(c("SampA", "SampB", "SampC"), builder, Limit = sym(Limit))) %>%
  tab_spanner(label = "Samples", columns = c(SampA, SampB, SampC))

这将适用于与您的列名称匹配的任何字符串向量，包括可以通过该colnames()函数创建的内容

names <- colnames(samples)[3:ncol(samples)]

gt(samples,rowname_col="Chem") %>% 
  tab_style(style = list(cell_fill(color = "grey80"), cell_text(weight = "bold")),
            locations = lapply(names, builder, Limit = sym(Limit))) %>%
  tab_spanner(label = "Samples", columns = c(SampA, SampB, SampC))