数字粘在一起作为字符

Question

我有一个带有测量值的数据集（txt文件，空格分隔），有些数字像这样粘在一起：

目前所有列都属于＆＃34;字符＆＃34;，因为转换后这些粘贴的数字得到了＆＃34; NA＆＃34; s。我为负数创建了一个例程，到目前为止很容易：

findandreplace <- function(file_name){


dat <- read_table2(file_name, col_names = FALSE)


  for (n in 0:9) {
    dat <- data.frame(lapply(dat, function(x) {gsub(paste0(n, "-"), paste0(n, " -"), x)}))
  }

  #save dat as txt and read it again
}

但是现在，我不知道如何分离正值。如果您愿意，可以使用此MWE：

b = c("340.9","341","316.1","336.8316.39","378.8","315","386.57317.33",NA,NA)
a  =c(1,2,3,4,5,6,7,8,9)
c  = data.frame(a,b)

应该是这样的：

b = c("340.9","341","316.1","336.8","316.39","378.8","315","386.57", "317.33")
a  =c(1,2,3,4,5,6,7,8,9)
c  = data.frame(a,b)

Answer 1

 x=unlist(strsplit(gsub("(.*)(3(?>\\d{2}\\.))","\\1 \\2",b,perl=T)," "))  
grep("\\d",x,value = T)
[1] "340.9"  "341"    "316.1"  "336.8"  "316.39" "378.8"  "315"    "386.57" "317.33"


transform(c,b=grep("\\d",x,value = T))
  a      b
1 1  340.9
2 2    341
3 3  316.1
4 4  336.8
5 5 316.39
6 6  378.8
7 7    315
8 8 386.57
9 9 317.33