R:表和多维数组中的维名称 [英] R: Dimension names in tables and multi-dimensional arrays

问题描述

由于我使用的函数需要一个表对象作为参数，因此我想将多维数组转换为表，但是维名称存在问题.

Since a function that I use requires a table object as parameter, I would like to convert a multidimensional array to a table, but I have problems with dimension names.

如as.table帮助文件中所指定，dnn参数应包含暗名.

As specified in the help file of as.table, the dnn parameter should contain dimnames names.

dnn … the names to be given to the dimensions in the result (the dimnames names).

但是即使指定dnn，由as.table生成的表也没有维度名称.

But even when specifying dnn, my tables produced by as.table have no dimension names.

以下代码说明了我的问题.

The following code illustrates my problem.

>test <- table(c("a","b","c","c","c"),c("1","2","3","2","2"),dnn=c("letters","numbers"))
>test 

          numbers
letters 1 2 3
      a 1 0 0
      b 0 1 0
      c 0 2 1

# this works perfectly

现在从数组构造表时尝试相同的方法:

now try the same when constructing the table from an array:

>my2dimdata <- array(c(1,0,0,0,1,2,0,0,1),dim=c(3,3),
                    dimnames=list(c("a","b","c"),
                                  c("1","2","3")))
>my2dimdata

  1 2 3
a 1 0 0
b 0 1 0
c 0 2 1

# the array as expected

>my2dimtable <- as.table(my2dimdata,dnn=c("letters","numbers"))
>my2dimtable

  1 2 3
a 1 0 0
b 0 1 0
c 0 2 1

# there are no dimnames

推荐答案

as.table没有dnn参数.您需要手动设置名称.

as.table doesn't have a dnn argument. You need to set the dimnames manually.

my2dimdata <- array(c(1,0,0,0,1,2,0,0,1),dim=c(3,3),
                    dimnames=list(c("a","b","c"),
                                  c("1","2","3")))

my2dimdata <- as.table(my2dimdata)
names(attributes(my2dimdata)$dimnames) <- c("letters","numbers")

#        numbers
# letters 1 2 3
#       a 1 0 0
#       b 0 1 0
#       c 0 2 1

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