flextable prints daply table (list of lists) with type name in PowerPoint table (instead of values)

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instead of plyr package, you can use the more modern dplyr, and tidyr sub packages via tidyverse

library(tidyverse)

use the following replacement

# data <- daply(data, .(product, date), summarize, sum(amount))
data <- group_by(data,
                 product,date) |> 
  summarise(amount=sum(amount)) |> 
  pivot_wider(names_from="date",
              values_from="amount")
# data <- cbind(product = rownames(data), data)
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