从R&x的xtable中修剪LaTeX表中的额外水平规则

时间:2016-11-01 00:36:42

标签: r latex xtable

问:如何在R&#39 {s} xtable中修剪LaTeX表中的额外水平规则长度?

我想在下面的R代码中执行您所看到的操作。但是该代码会抛出错误,而不会产生预期的结果。

% table 1
    \begin{table}[ht]
      \centering
      \begin{tabular}{@{}lrr@{}}
        \toprule  
        & a\_a & b\_b \\ 
        \midrule 
        A & 0.35 & -1.05 \\ 
        B & 0.64 & 0.92 \\ 
        \bottomrule 
      \end{tabular}
    \end{table}

% table 2 
    \begin{table}[ht]
      \centering
      \begin{tabular}{lrr}
        \toprule  
        & a\_a & b\_b \\ 
        \midrule 
        A & 0.36 & -1.05 \\ 
        B & 0.64 & 0.92 \\ 
        \bottomrule 
      \end{tabular}
    \end{table}

tables

# Begin R code
library(xtable)
library(stringr)
options(xtable.comment = FALSE)
set.seed(10)
mat <- matrix(rnorm(4), nrow=2)
rownames(mat) <- LETTERS[1:2]
colnames(mat) <- str_c(letters[1:2], "_", letters[1:2])
#mat.x <- xtable(mat, caption="My Caption!", align="lrr", digits=2) # No Error!
mat.x <- xtable(mat, align="@{}lrr@{}", digits=2) # Error!
print(mat.x, 
      sanitize.text.function = function(x){x},
      sanitize.colnames.function = function(x){str_replace_all(x, "_", "\\\\_")},
      floating=T,
      hline.after=NULL,
      math.style.negative=F,
      add.to.row=list(pos=list(-1,0,nrow(mat.x)),
                      command=c("\\toprule ", "\\midrule ", "\\bottomrule ")))

# Error in `align<-.xtable`(`*tmp*`, value = "@{}lrr@{}") : 
#  "align" must have length equal to 3 ( ncol(x) + 1 )
# In addition: Warning message:
#  In .alignStringToVector(value) : Nonstandard alignments in align string

1 个答案:

答案 0 :(得分:2)

您需要传递一个字符串,其字符数与列数+ 1相同,或者传递此长度的字符串。所以尝试(除了其他排列)

align=c("@{}l", "r", "r@{}")

看看为什么看看这些功能。

library(xtable)

set.seed(10)
mat <- matrix(rnorm(4), nrow=2)
rownames(mat) <- LETTERS[1:2]
colnames(mat) <- paste0(letters[1:2], "_", letters[1:2])
xtable(mat, align="@{}lrr@{}", digits=2) 
  

“align”的长度必须等于3(ncol(x)+ 1)

警告建议传递长度为3的向量,请尝试

xtable(mat, align=c("@{}l","r", "r@{}"), digits=2)
# \begin{table}[ht]
# \centering
# \begin{tabular}{@{}lrr@{}}
# ---
# ---

这样可以正常工作。对齐参数对于传递字符串的方式也很稳健, 只要它具有所需的长度。

xtable(mat, align=c("@{}lrr@", "{", "}"), digits=2)
# \begin{table}[ht]
# \centering
# \begin{tabular}{@{}lrr@{}}
# ---
# ---

要了解为什么第一个字符串不起作用 查看xtable:::xtable.data.frame函数的相关部分:必须与align

相关
align(x) <- switch(1 + is.null(align), align, c("r", c("r", "l")[(characters | factors) + 1]))

这会导致xtable:::`align<-.xtable,然后是xtable:::.alignStringToVector