使用DT软件包的数据表中的订购因子 [英] Ordering factors in data table using DT package

问题描述

我有一些数据想要以5％的增量显示，例如5-10％，10-15％等.为此，我有一个数据框将其存储为一个因子，其级别为范围的中点，标签是要显示的范围.例如，级别12.5将标记为10-15％.

I have data that I want to display in 5% increments, such as 5-10%, 10-15%, etc. To do this, I have a data frame that stores them as a factor, with the levels being the midpoint of the range, and the label being the range to display. For example, the level 12.5 would be labeled 10-15%.

但是，我在使用数据表正确排序时遇到了麻烦.

However, I'm having trouble sorting this correctly using a datatable.

library('DT')
example <- data.frame(name = c('A', 'B', 'C', 'D'),
                  value = factor(c(7.5, 12.5, 7.5, 17.5),
                                  levels = c(7.5, 12.5, 17.5),
                                  labels = c('5-10%', '10-15%', '15-20%')))

datatable(example,
      rownames = FALSE,
      options = list(order = list(1, 'asc')))

如您所见，它似乎是按字符串的第一个数字排序的，而不是按因子级别排序的.

As you can see, it appears to be sorting off of the first number of the character string, rather than sorting by the level of the factor.

关于如何获取数据表以排序因子级别而不是字符串的任何想法? (除了在将数据帧传递到数据表之前对其进行排序之外，我希望可以通过单击排序箭头在任一方向上对其进行正确排序)

Any ideas on how I can get the data table to sort off of the factor levels, rather than the character string? (Other than ordering the data frame before passing it into the data table - I would like this to be correctly sortable in either direction by clicking the sort arrow)

推荐答案

您可以使用带有因子数值的隐藏列，并根据该隐藏列对因子进行排序:

You could use a hidden column with the numeric value of the factor and sort the factors according to that hidden column:

library('DT')
value <- factor(c(7.5, 12.5, 7.5, 17.5),
                levels = c(7.5, 12.5, 17.5),
                labels = c('5-10%', '10-15%', '15-20%'))

example <- data.frame(name = c('A', 'B', 'C', 'D'),
                      value = value,
                      levels=as.numeric(value))

datatable(example,
          rownames = FALSE,
          options = list(columnDefs=list(list(orderData=2,targets=1),
                                         list(visible=FALSE,targets=2))))

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