[R] a simple reshape

Yuan Chun Ding ycd|ng @end|ng |rom coh@org
Fri Apr 3 20:57:28 CEST 2020

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,


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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