如何在 R 中创建包含列名、数据类型和少量数据的数据表？

Question

I was wondering if I can create DataTable containing 4 columns. "Column Name","Data Type" "top 5" and "last5" data? Basically, converting str(df) output into datatable. Not sure if there is package available for this task. If there is please point to that package.

Thanks in advance for your time and efforts!

Answer 1

Something like this might help:

Let's say your data looks like this

data = data.frame(
  x1 = sample(letters,20),
  x2 = sample(1:100,20)
)

Then, you can create a DataTable with your five columns like this:

data.table(
  ColumnName = colnames(data),
  DataType = sapply(data,typeof),
  first5 = lapply(data,head,5),
  last5 = lapply(data,tail,5)
)

Output:

   ColumnName  DataType         first5          last5
1:         x1 character      x,w,p,c,n      h,k,z,t,f
2:         x2   integer 24,26,20,72, 1 45,25,18,80,54