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Odd insistence on ungroup()
myDF <- data.frame(A = sample(LETTERS[1:4], 100, replace = TRUE),
B = sample(letters[5:9], 100, replace = TRUE),
C = rnorm(100))
summaryDF <- myDF %>% group_by(A, B) %>% dplyr::summarise(meanC = mean(C))
summaryDF %>% spread(B, meanC) # Error: index out of bounds
summaryDF %>% ungroup() %>% spread(B, meanC) # Works

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petbadger commented Aug 7, 2018

The above code actually does work now (at least for me) I find some dplyr nuisances are actually caused by the data being a Tibble. Maybe that was the problem 4 years ago...

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