General
PromptBeginner5 minmarkdownQuality: 24
con <- file(big.csv
r)
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Showing 24 of 131,462Categories: Data & Insights, Communication, Data, Cursor-rules, General, Coding & Debugging
General
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RDS (single R object
preserves types)
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General
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save(df1
df2
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Data
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saveRDS(obj
data.rds)
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Data
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df <- read.csv(data.csv
stringsAsFactors = FALSE)
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Data
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df <- read.table(data.txt
header = TRUE
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General
PromptBeginner5 minmarkdownQuality: 24
grepl(pattern
x) # logical vector
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General
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strsplit(a
b
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General
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grep(pattern
x) # indices of matches
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General
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substr(hello
1
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General
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gsub(old
new
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General
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sprintf(%.2f%%
3.14159) # 3.14%
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Data
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aggregate(value ~ group
data = df
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General
PromptBeginner5 minmarkdownQuality: 24
paste0(x
1:3) # x1 x2 x3
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General
PromptBeginner5 minmarkdownQuality: 24
paste(a
b
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General
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apply(m
2
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General
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mapply(function(x
y) x + y
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General
PromptBeginner5 minmarkdownQuality: 24
tapply(df$value
df$group
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General
PromptBeginner5 minmarkdownQuality: 24
lapply(lst
function(x) x[1])
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General
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apply — over matrix margins (1=rows
2=cols)
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General
PromptBeginner5 minmarkdownQuality: 24
vapply(lst
length
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General
PromptBeginner5 minmarkdownQuality: 24
sapply(lst
length)
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General
PromptBeginner5 minmarkdownQuality: 24
sapply(1:5
\(x) x^2)
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General
PromptBeginner5 minmarkdownQuality: 24
do.call(paste
list(a
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