On Tue, 14 Sep 2021, Eric Berger wrote:
This code is not correct:
disc_by_month %>%
group_by(year, month) %>%
summarize(disc_by_month, vol = mean(cfs, na.rm = TRUE))
It should be:
disc %>% group_by(year,month) %>% summarize(vol=mean(cfs,na.rm=TRUE)
Eric/Avi:
That makes no difference:
disc_by_month
# A tibble: 590,940 × 6
# Groups: year, month [66]
year month day hour min cfs
<int> <int> <int> <int> <int> <dbl>
1 2016 3 3 12 0 149000
2 2016 3 3 12 10 150000
3 2016 3 3 12 20 151000
4 2016 3 3 12 30 156000
5 2016 3 3 12 40 154000
6 2016 3 3 12 50 150000
7 2016 3 3 13 0 153000
8 2016 3 3 13 10 156000
9 2016 3 3 13 20 154000
10 2016 3 3 13 30 155000
# … with 590,930 more rows
I wondered if I need to group first by hour, then day, then year-month.
This, too, produces the same output:
disc %>%
group_by(hour) %>%
group_by(day) %>%
group_by(year, month) %>%
summarize(disc_by_month, vol = mean(cfs, na.rm = TRUE))
And disc shows the read dataframe.
I don't understand why the columns are not grouping.
Thanks,
Rich
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