[R] a simple reshape

Jim Lemon drj|m|emon @end|ng |rom gm@||@com
Fri Apr 3 23:44:03 CEST 2020

Hi Ding,
If you are still having trouble, perhaps:



On Sat, Apr 4, 2020 at 5:58 AM Yuan Chun Ding <ycding using coh.org> wrote:
> Hi R users,
> I want to do a data reshape from long to wide, I thought it was easy using tidyverse spread function, but it did not work well. Can you help me?
> Thank you,
> Ding
> test1 data frame is long file and test2 is the wide file I want to get
> test1 <- data.frame (vntr1=c("v1","v1", "v2","v2","v2","v2"),
>                      val =c(0.98,0.02, 0.59,0.12,0.11,0.04))
> test2  <- data.frame(vntr1=c("v1","v2"),
>                      a1 =c(0.98, 0.5693),
>                      a2 = c(0.02, 0.12),
>                      a3 =c(NA, 0.11),
>                      a4=c(NA, 0.04))
> the following code does not work
> test2 <-test1 %>%spread(vntr1, val)
>  Error: Each row of output must be identified by a unique combination of keys.
> Keys are shared for 6 rows:
> * 1, 2
> * 3, 4, 5, 6
> Do you need to create unique ID with tibble::rowid_to_column()?
> Call `rlang::last_error()` to see a backtrace
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