如何解决R: read_fwf () 从文件夹中读取多个文本文件,然后将 csv 文件写入同一文件夹即,将文本文件文件夹转换为 csv 文件文件夹
我想从一个包含空格分隔的文本文件的文件夹中读取文件,然后将它们作为 csv 文件写出到同一文件夹中。
空格分隔的文本文件很烦人,第二行是破折号,每个文件末尾的三行有一些不正确的摘要值(见下文)。这些已通过“read_fwf”中的“评论”和“跳过”参数删除。如果有更好的方法来实现这一点,请指教。
Frame Clusters Total Area
-----------------------------
0 2 353
1 2 233
2 1 18
3 1 18
... ... ...
6230 1 38
6231 2 183
Total qualifying frame count = 6105
Total file cluster count = 42005
Total file biomass area = 8867980
我正在尝试使用 lapply 等 tidyverse 选项而不是编码循环。
我想我正在阅读文本文件。我的失败似乎出在代码的 write.csv 部分。
作为 R 的新用户,我将不胜感激任何建议或语法链接(即括号、缩进等)。论坛帖子的清晰度提示也会有所帮助。谢谢。
# Clear all variables
rm(list = ls())
# Reference tidyverse
library(tidyverse)
# Create variable,"folder" for location of text files
folder <- "C:/Users/stai669/OneDrive - PNNL/Desktop/CRDC_P/DP/DIDSON snip
files/largeDataset/Cluster/Aft/N/"
# Create variable,"file_list" that lists all files in folder for "lapply" to loop through
filelist <- list.files(path = folder,pattern = "*.txt")
# Read in each file with "lapply"; other arguments for column names,etc.
data <- lapply(filelist,function(x) {
textfile <- read_fwf(
paste(folder,x,sep = ""),fwf_positions(start = c(1,6,17),end = c(5,16,29),comment = "T",col_names = c("fram","clust","biom"),skip = 2,cols(fram = col_integer(),clust = col_integer(),biom = col_integer())
)
# Write the files to csv in the same folder
write.csv(textfile,file = sub(pattern = "\\.txt$",replacement = ".csv",x = x))
})
解决方法
# Clear all variables
rm(list = ls())
# Reference tidyverse
library(tidyverse)
# Create variable,"file_list" that lists all files in folder for "lapply()" to loop through
filelist <- list.files(pattern = "*.txt")
# Read in each file with "lapply"; other arguments for column names,etc.
data <- lapply(filelist,function(x) {
textfile <- read_fwf(
paste(x,sep = ""),fwf_positions(start = c(1,6,17),end = c(5,16,29),col_names = c("fram","clust","biom")),comment = "T",skip = 2,cols(fram = col_integer(),clust = col_integer(),biom = col_integer())
)
# Write the files as csv to the same folder
write.csv(textfile,file = sub(pattern = "\\.txt$",replacement = ".csv",x = x))
})
再次注意,“col_names”参数与“fwf_positions”一起使用。
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