[英]Lists and matrix using sapply
I have a perhaps basic questions and I have searched on the web. 我有一个基本的问题,我在网上搜索过。 I have a problem reading files.
我在阅读文件时遇到问题。 Though, I managed to get to read my files, following @Konrad suggestions, which I appreciate: How to get R to read in files from multiple subdirectories under one large directory?
虽然,我设法阅读我的文件,遵循@Konrad的建议,我很欣赏:如何让R从一个大目录下的多个子目录中读取文件?
It is a similar problem, however, I have not resolved it. 这是一个类似的问题,但是,我还没有解决它。
My problem: 我的问题:
I have large number of files of with same name ("tempo.out") in different folders. 我在不同的文件夹中有大量具有相同名称(“tempo.out”)的文件。 This tempo.out has 5 columns/headers.
这个tempo.out有5列/标题。 And they are all the same format with 1048 lines and 5 columns:
它们都是1048行和5列的相同格式:
id XY time temp id XY时间温度
setwd("~/Documents/ewat")
dat.files <- list.files(path="./ress",
recursive=T,
pattern="tempo.out"
,full.names=T)
readDatFile <- function(f) {
dat.fl <- read.table(f)
}
data.filesf <- sapply(dat.files, readDatFile)
# I might not have the right sintax in sub5:
subs5 <- sapply(data.filesf,`[`,5)
matr5 <- do.call(rbind, subs5)
probs <- c(0.05,0.1,0.16,0.25,0.5,0.75,0.84,0.90,0.95,0.99)
q <- rowQuantiles(matr5, probs=probs)
print(q)
I want to extract the fifth column (temp) of each of those thousands of files and make calculations such as quantiles. 我想提取这些数千个文件中的每一个的第五列(temp)并进行分位数等计算。
I tried first to read all subfiles in "ress" 我首先尝试阅读“ress”中的所有子文件
The latter gave no error, but my main problem is the "data.filesf" is not a matrix but list, and actually the 5th column is not what I expected. 后者没有给出任何错误,但我的主要问题是“data.filesf”不是矩阵而是列表,实际上第5列并不是我所期望的。 Then the following:
然后是以下内容:
matr5 <- do.call(rbind, subs5)
is also not giving the required values/results. 也没有给出所需的值/结果。
What could be the best way to get columns into what will become a huge matrix? 什么可能是让列成为巨大矩阵的最佳方法?
尝试lapply(data.filef, [
,, 5)希望这会有所帮助
Consider extending your defined function, readDatFile , to extract fifth column, temp , and assign directly to matrix with sapply
or vapply
(since you know ahead the needed structure -numeric matrix length equal to nrows or 1048). 考虑扩展您定义的函数readDatFile ,以提取第五列, temp ,并使用
sapply
或vapply
直接分配给矩阵(因为您vapply
知道所需的结构 - 数字矩阵长度等于nrows或1048)。 Then, run needed rowQuantiles
: 然后,运行所需的
rowQuantiles
:
setwd("~/Documents/ewat")
dat.files <- list.files(path="./ress",
recursive=T,
pattern="tempo.out",
full.names=T)
readDatFile <- function(f) read.table(f)$temp # OR USE read.csv(f)[[5]]
matr5 <- sapply(dat.files, readDatFile, USE.NAMES=FALSE)
# matr5 <- vapply(dat.files, readDatFile, numeric(1048), USE.NAMES=FALSE)
probs <- c(0.05,0.1,0.16,0.25,0.5,0.75,0.84,0.90,0.95,0.99)
q <- rowQuantiles(matr5, probs=probs)
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