General
PromptBeginner5 minmarkdown
par(mfrow = c(2
2)) # 2x2 grid
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General
PromptBeginner5 minmarkdown
par(mfrow = c(1
1)) # reset
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General
PromptBeginner5 minmarkdown
col = lightyellow
main = By Group)
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Data
PromptBeginner5 minmarkdown
boxplot(value ~ group
data = df
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General
PromptBeginner5 minmarkdown
main = Distribution
xlab = Value)
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General
PromptBeginner5 minmarkdown
hist(x
breaks = 30
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General
PromptBeginner5 minmarkdown
barplot(table(df$category)
main = Counts
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General
PromptBeginner5 minmarkdown
col = lightblue
las = 2)
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General
PromptBeginner5 minmarkdown
lines(x
y2
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General
PromptBeginner5 minmarkdown
plot(x
y
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General
PromptBeginner5 minmarkdown
pch = 19
col = steelblue
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General
PromptBeginner5 minmarkdown
plot(x
y
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General
PromptBeginner5 minmarkdown
chunk <- readLines(con
n = 100)
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General
PromptBeginner5 minmarkdown
con <- file(big.csv
r)
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General
PromptBeginner5 minmarkdown
save(df1
df2
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Data
PromptBeginner5 minmarkdown
saveRDS(obj
data.rds)
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Data
PromptBeginner5 minmarkdown
df <- read.table(data.txt
header = TRUE
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General
PromptBeginner5 minmarkdown
# RDS (single R object
preserves types)
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General
PromptBeginner5 minmarkdown
strsplit(a
b
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Data
PromptBeginner5 minmarkdown
df <- read.csv(data.csv
stringsAsFactors = FALSE)
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Writing & Content
PromptBeginner5 minmarkdown
write.csv(df
output.csv
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General
PromptBeginner5 minmarkdown
grep(pattern
x) # indices of matches
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General
PromptBeginner5 minmarkdown
grepl(pattern
x) # logical vector
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General
PromptBeginner5 minmarkdown
gsub(old
new
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