人们有很多线程认为他们在读取csv文件时丢失了数字，而仅仅是数字设置并没有显示全部。
另一方面，我想将输入的数据四舍五入或截断到两位小数。我在Rmarkdown中遇到问题，在突出显示字段后我无法限制小数位。
这导致我尝试在高亮显示之前四舍五入，但是如果我使用低于0的数字，则如果我低于4位，则会导致不良结果。它还会不时地抛出科学数字。 ...在我的桌子上看起来不太干净。
df.csv
Sample blank square stool ball triangle circle hammer dog
1: 16-ww3 0.00090 0.93100 0.01219 0.00006 0.00606 0.00180 0.00000 0.00003
2: 17-e 0.00034 0.67452 0.00297 0.00006 0.00357 0.00172 0.00008 0.00001
3: 21-r9a 0.00186 0.34577 0.01558 0.00020 0.02277 0.00586 0.00009 0.00012
4: 7-d 0.00003 0.00352 0.01179 0.00003 0.01640 0.56326 0.00349 0.00064
5: 7401-1 0.00151 0.55153 0.00196 0.00017 0.00055 0.00029 0.00012 0.00000
6: 7401-2 0.00056 0.50825 0.00433 0.00010 0.00000 0.00008 0.00006 0.00003
代码
library(kableExtra)
library(magrittr)
DF <- read.csv(file="df.csv"), header=TRUE, sep=",",stringsAsFactors = FALSE)
DF[1:nrow(DF), 2:ncol(DF)] <- round(DF[1:nrow(DF), 2:ncol(DF)], 4)
paint <- function(x) {
ifelse(x < 0.1, "white", ifelse(x < 0.2, "yellow", "red"))
}
DF %<>%
mutate_if(is.numeric, function(x) {
cell_spec(x, background = paint(x), format = "latex")
})
kable(DF, caption = "Highlighted numbers near zero", digits = 2, format = "latex", booktabs = T, escape = F, longtable = T)%>%
kable_styling(latex_options = c("striped", "hold_position", "repeat_header", font_size = 6))%>%
landscape()%>%
row_spec(0, angle = 45)
所需的输出
numbers formatted like: 0.00 0.01 0.10 1.10
AND highlighted as described in the paint function
答案 0 :(得分：2)
如果我正确理解了您的需求，那么应该可以：
首先，我们使用formatC将数字列转换为具有所需小数位数的字符向量
DF[, -1] = lapply(DF[, -1], formatC, format = 'f', flag='0', digits = 2)
现在，我们可以使用以下格式应用乳胶格式：
DF[,-1] = lapply(DF[,-1], function(x) cell_spec(x, background = paint(x), format = "latex"))
请注意，paint仍适用于字符向量，因为与数字值的比较会将其强制为数字。
这是一个完整的可复制示例，在实践中证明了这一点
set.seed(1234)
DF <- data.frame(V1 = sample(letters,10,T), V2 = abs(rnorm(10)), V3 = abs(rnorm(10)))
DF[, -1] = lapply(DF[, -1], formatC, format = 'f', flag='0', digits = 2)
DF[, -1] = lapply(DF[,-1], function(x) cell_spec(x, background = paint(x), format = "latex"))
# V1 V2 V3
# 1 c \\cellcolor{red}{0.51} \\cellcolor{yellow}{0.11}
# 2 q \\cellcolor{red}{0.57} \\cellcolor{red}{0.51}
# 3 p \\cellcolor{red}{0.55} \\cellcolor{red}{0.91}
# 4 q \\cellcolor{red}{0.56} \\cellcolor{red}{0.84}
# 5 w \\cellcolor{red}{0.89} \\cellcolor{red}{2.42}
# 6 q \\cellcolor{red}{0.48} \\cellcolor{yellow}{0.13}
# 7 a \\cellcolor{red}{1.00} \\cellcolor{red}{0.49}
# 8 g \\cellcolor{red}{0.78} \\cellcolor{red}{0.44}
# 9 r \\cellcolor{white}{0.06} \\cellcolor{red}{0.46}
# 10 n \\cellcolor{red}{0.96} \\cellcolor{red}{0.69}
kable(DF, caption = "Highlighted numbers near zero",
digits = 2, format = "latex", booktabs = T, escape = F, longtable = T) %>%
kable_styling(latex_options = c("striped", "hold_position",
"repeat_header", font_size = 6)) %>%
landscape() %>%
row_spec(0, angle = 45)
# \begin{landscape}
# \begin{longtable}{lll}
# \caption{\label{tab:}Highlighted numbers near zero}\\
# \toprule
# \rotatebox{45}{V1} & \rotatebox{45}{V2} & \rotatebox{45}{V3}\\
# \midrule
# \endfirsthead
# \caption[]{Highlighted numbers near zero \textit{(continued)}}\\
# \toprule
# \rotatebox{45}{V1} & \rotatebox{45}{V2} & \rotatebox{45}{V3}\\
# \midrule
# \endhead
# \
# \endfoot
# \bottomrule
# \endlastfoot
# \rowcolor{gray!6} c & \cellcolor{red}{0.51} & \cellcolor{yellow}{0.11}\\
# q & \cellcolor{red}{0.57} & \cellcolor{red}{0.51}\\
# \rowcolor{gray!6} p & \cellcolor{red}{0.55} & \cellcolor{red}{0.91}\\
# q & \cellcolor{red}{0.56} & \cellcolor{red}{0.84}\\
# \rowcolor{gray!6} w & \cellcolor{red}{0.89} & \cellcolor{red}{2.42}\\
# \addlinespace
# q & \cellcolor{red}{0.48} & \cellcolor{yellow}{0.13}\\
# \rowcolor{gray!6} a & \cellcolor{red}{1.00} & \cellcolor{red}{0.49}\\
# g & \cellcolor{red}{0.78} & \cellcolor{red}{0.44}\\
# \rowcolor{gray!6} r & \cellcolor{white}{0.06} & \cellcolor{red}{0.46}\\
# n & \cellcolor{red}{0.96} & \cellcolor{red}{0.69}\\*
# \end{longtable}
# \end{landscape}