dplyr - Create a new column that displays multi column matches in R -


i want make new column, factors column 'a' have 1 match (value == 1) column 'b' assigned true.

a <- c(555, 555, 555, 666, 666, 666, 777, 777) b <- c(1, 0, 0, 0, 0, 0, 1, 0) df <- data.frame(a, b)

the result want is

      b   c 1  555  1   1 2  555  0   1 3  555  0   1 4  666  0   0    5  666  0   0 6  666  0   0 7  777  1   1 8  777  0   1

thanks in advance,

we can use dplyr package.

library(dplyr) df2 <- df %>%   group_by(a) %>%   mutate(c = max(b)) df2 # tibble: 8 x 3 # groups:   [3]           b     c   <dbl> <dbl> <dbl> 1   555     1     1 2   555     0     1 3   555     0     1 4   666     0     0 5   666     0     0 6   666     0     0 7   777     1     1 8   777     0     1

or data.table package.

library(data.table) dt <- as.data.table(df) dt2 <- dt[, c := max(b), = a] dt2      b c 1: 555 1 1 2: 555 0 1 3: 555 0 1 4: 666 0 0 5: 666 0 0 6: 666 0 0 7: 777 1 1 8: 777 0 1

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