在R中展平或取消列出数据框

Question

我正在使用该Googleway软件包获取一堆lat长坐标的高程信息,其总共有954个.

我将调用分成3个单独的文件,但它们是列表格式,当我将它们转换为数据帧时,它们是嵌套的数据帧格式.我一直试图压扁文件并取消列出,但我没有成功.

DF <- read.csv("Site Coor R.csv", header = T, colClasses = c("numeric","numeric"))

result1 <- google_elevation(df_locations = DF[1:350,], key = "KEY")
result2 <- google_elevation(df_locations = DF[351:700,], key = "KEY")
result3 <- google_elevation(df_locations = DF[701:954,], key = "KEY")

> str(result1)
List of 2
 $ results:'data.frame':    350 obs. of  3 variables:
  ..$ elevation : num [1:350] 14.15 2.14 2.66 6.78 23.27 ...
  ..$ location  :'data.frame':  350 obs. of  2 variables:
  .. ..$ lat: num [1:350] 52.7 52.7 52.7 52.9 52.7 ...
  .. ..$ lng: num [1:350] -8.61 -8.83 -8.92 -8.98 -8.91 ...
  ..$ resolution: num [1:350] 611 611 611 611 611 ...
 $ status : chr "OK"


do.call("c", result1[["location"]])

要么

result1 <- unlist(result1, recursive = TRUE, use.names = TRUE)

要么

write.table(data.frame(subset(result1DF,select=-c(results.location)),unclass(result1DF$results.location)))

既然result1,result2并且result3具有相同的结构,有一种简单的方法来合并它们,展平连接表然后导出为CSV？

Answer 1

我们可以获取a中的所有对象list并data.frame在单个调用中创建

lst <- lapply(mget(paste0("result", 1:3)), function(x) do.call(data.frame, x$results))
str(lst[[1]])
#'data.frame':   12 obs. of  3 variables:
#$ elevation   : num  -0.546 0.537 0.42 -0.584 0.847 ...
#$ location.lat: int  61 85 53 80 82 52 66 62 68 57 ...
#$ location.lng: int  11 7 10 19 1 -2 -6 -8 -14 -13 ...

如果我们需要一个表,那么rbind它们在一起

library(data.table)
dt <- rbindlist(lst)
fwrite(dt, file = "yourfile.csv")

数据

f1 <- function(seed){
     set.seed(seed)
     results <- data.frame(elevation = rnorm(12))
     results$location <- data.frame(lat = sample(50:100, 12, replace=TRUE), 
           lng = sample(-15:20, 12, replace=TRUE))
      results
  }

result1 <- list(results = f1(24), status = "OK")
result2 <- list(results = f1(42), status = "OK")
result3 <- list(results = f1(343), status = "OK")