Ich habe eine Reihe von CSV-Dateien mit dem Header aber Wie eine Funktion auf eine bestimmte Spalte von Datenrahmen Speichern in einer Liste anwenden
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<p>arrtime</p>
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<p>interaatime</p>
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<p>serTime</p>
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<p>DepTime</p>
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<p>ActSerTime</p>
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<p>8.37</p>
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<p>0</p>
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<p>8.39</p>
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<p>8.40</p>
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<p>0.01</p>
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<p>8.39</p>
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<p>2</p>
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<p>8.40</p>
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<p>8.42</p>
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<p>0.02</p>
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<p>8.40</p>
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<p>1</p>
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<p>8.42</p>
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<p>8.46</p>
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<p>0.04</p>
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ich dergleichen
verwendet, um Datensätze für verschiedene Tage enthalten Code, um die Dateien#Scripts to load all the csv files of the queue data from day 1 to 13
path <- "/home/ilanre/Documents/Queue Research Work/"
files <- list.files(path=path, pattern="*.csv")
for(file in files)
{
perpos <- which(strsplit(file, "")[[1]]==".")
assign(
gsub(" ","",substr(file, 1, perpos-1)),
read.csv(paste(path,file,sep="")))
}
ich verwenden lappy() -Funktion importieren möchten die Summe der Spalte 2 und 5 für jeden Tag zu finden und speichern Sie alle in der Liste oder DATAf rame Danke