Function Errors

summarise result size

Matches: Result must be size 1, not

WHAT THIS ERROR MEANS

Inside summarise(), each summary expression must return a single value per group. You used a function that returns multiple values.

1. Use a summary function like mean(), sum(), n(), first(), last().

2. If you need multiple values, use reframe() instead of summarise().

3. Wrap in list() if you need to store vectors.

BAD — THIS CAUSES THE ERROR

df %>% group_by(category) %>% summarise(values = range(price))

GOOD — CORRECT APPROACH

df %>% group_by(category) %>% summarise(min_price = min(price), max_price = max(price))

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