[R] Tidyverse data frame conversion from monthly to annual

[PIKAL Petr]

Hi

aggregate is another option.

aggregate(df[, 2:4], list(df$Year), sum)

Cheers
Petr

> -----Original Message-----
> From: R-help <r-help-bounces using r-project.org> On Behalf Of
> phil using philipsmith.ca
> Sent: Monday, March 4, 2019 4:15 AM
> To: r-help using r-project.org
> Subject: [R] Tidyverse data frame conversion from monthly to annual
>
> I have a data frame in which the first column is a sequence of monthly dates
> and the other columns are variables. There are a great many variables. I want
> to create another data frame similar to the first one, but with annual values
> instead of monthly, created by summing the months within each year.
>
> I am able to do this as shown in this reprex:
>
> library(tidyverse)
> REF_DATE <- seq(as.Date("2000/1/1"),by="month",length.out=36)
> set.seed(57)
> df <- data.frame(REF_DATE,
>                   x=sample(1:100,size=36),
>                   y=sample(1:100,size=36),
>                   z=sample(1:100,size=36),
>                   Year=year(REF_DATE))
> df1 <- df %>%
>    group_by(Year) %>%
>    summarise(x_a=sum(x),y_a=sum(y),z_a=sum(z)) %>%
>    ungroup()
>
> However, while this works for the simple case with only three variables, I
> actually have many more than three, so I am looking for a more general
> approach. I have no clue as to how to proceed. Any advice will be much
> appreciated.
>
> Philip
>
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