将逗号分隔的长字符串转换为 x 和 y 列

Question

我的数据是一长串由逗号分隔的单行值，其中每隔一个值是一个 x 或 y 坐标

数据如下所示： 2622731,1387660,2621628,1444522,2619235,1681640

但我希望它看起来像这样：

2622731,1387660

2621628,1444522

2619235,1681640

如果没有像我在上面的示例中那样遍历整个文件并删除逗号并按回车键，我该如何在 R（或 Stata）中自动执行此操作？

Answer 1

在 R 中：

## Read in your data
## data = readLines("path/to/your_file.txt")
## Should get you something like this (using the example in your Q)
data = "2622731,1387660,2621628,1444522,2619235,1681640"
data = unlist(strsplit(data, ","))
data = matrix(as.numeric(data), ncol = 2, byrow = TRUE)
data
#         [,1]    [,2]
# [1,] 2622731 1387660
# [2,] 2621628 1444522
# [3,] 2619235 1681640

到那个时候，也许

data = as.data.frame(data)
names(data) = c("x", "y")
#         x       y
# 1 2622731 1387660
# 2 2621628 1444522
# 3 2619235 1681640

Answer 2

在 Stata 中，公认的 R 解决方案的类似物可能涉及 split 和 reshape long。这是另一种方法：

* data example 
clear
set obs 1
gen strL data = "2622731,1387660,2621628,1444522,2619235,1681640"

* code for data example 
replace data = subinstr(data, ",", " ", .)
set obs `=wordcount(data)/2' 
gen x = real(word(data[1], 2 * _n - 1))
gen y = real(word(data[1], 2 * _n))

list 

     +---------------------------------------------------------------------+
     |                                            data         x         y |
     |---------------------------------------------------------------------|
  1. | 2622731 1387660 2621628 1444522 2619235 1681640   2622731   1387660 |
  2. |                                                   2621628   1444522 |
  3. |                                                   2619235   1681640 |
     +---------------------------------------------------------------------+

Answer 3

使用 scan 并使用 matrix 重塑：

s <- "2622731,1387660,2621628,1444522,2619235,1681640" # test data

matrix(scan(text = s, sep = ",", quiet = TRUE), ncol = 2, byrow = TRUE)
##         [,1]    [,2]
## [1,] 2622731 1387660
## [2,] 2621628 1444522
## [3,] 2619235 1681640

将逗号分隔的长字符串转换为 x 和 y 列

Converting long string of comma delimited integers into x and y columns

r

data-manipulation

stata