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R / Subsetting

Subset function

Learn subset function in R through a focused explanation, a dedicated topic-specific example, an engineering boundary, and a mastery check.

10 min read • Intermediate

subset function is an atomic R topic inside Subsetting. The example uses the named construct directly so you can see its syntax, data flow, and observable behavior.

Read the code by locating the exact feature named subset function, then trace the value before and after that feature runs. This lesson is intentionally isolated from neighboring topics: changing identifiers alone would not reproduce the same behavior because the construct itself is different.

Topic-specific example

r-0032-63368dca96.R
r Try It Live 
df <- data.frame(id=1:4,score=c(4,8,9,3))
print(subset(df, score>=8))
Edge case / engineering note

For subset function, test the boundary that makes the feature meaningful: invalid input, an empty value, a missing branch, lifecycle/cleanup, or a type/runtime constraint. Do not infer correctness only from the happy path.

Content source & attribution
Original Syntaxis Content · Original Syntaxis Content

Lesson quizzes

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