Fix broken cross-refs
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@ -120,7 +120,7 @@ flights |>
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filter(month %in% c(1, 2))
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```
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We'll come back to these comparisons and logical operators in more detail in Chapter \@ref(logicals-numbers).
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We'll come back to these comparisons and logical operators in more detail in Chapter \@ref(logical).
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When you run `filter()` dplyr executes the filtering operation, creating a new data frame, and then prints it.
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It doesn't modify the existing `flights` dataset because dplyr functions never modify their inputs.
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@ -530,7 +530,7 @@ flights |>
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)
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```
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## Making groups
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## Making groups {#groups-from-logical}
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Before we move on to the next chapter, I want to show you one last trick.
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I don't know exactly how to describe it, and it feels a little magical, but it's super handy so I wanted to make sure you knew about it.
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@ -458,7 +458,7 @@ lead(x)
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```
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- `x == lag(x)` tells you when the current value changes.
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This is often useful combined with the cumulative tricks describe in Section \@ref(cumulative-tricks).
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This is often useful combined with the grouping trick described in Section \@ref(groups-from-logical).
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```{r}
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x == lag(x)
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