r - Generate a pandoc table without repeated values -

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i use pander generate pandoc style tables, need suppress repeated values of variables example:

ta <- data.frame(class=c(rep("c1" ,3), rep("c2", 6)),                  name=rep(c("l", "v", "c"), each=3), num=rpois(9, 10))  pandoc.table(ta)

the output is

    --------------------     class   name   num      ------- ------ -----     c1      l     15        c1      l     11        c1      l      8        c2      v      7        c2      v      7        c2      v      5        c2      c     12        c2      c      9        c2      c     12     --------------------

and like

    --------------------     class   name   num      ------- ------ -----     c1      l     15                      11                       8        c2      v      7                       7                       5                c     12                       9                      12     --------------------

the problem similar removing locally repeated values , use dplyr data.frames solution using mutate should worth, tried did not work:

mutate(ta, class=ifelse(lag(class,1) == class & !is.na(lag(class,1)), "", class ))

this seems open bug corrected. in meantime workaround seems job:

mutate(ta, class=ifelse(levels(class)[lag(class,1)] == class & !is.na(levels(class)[lag(class,1)]), "", class))   class name num 1     1    l   8 2          l  14 3          l  12 4     2    v  11 5          v   7 6          v  15 7          c  16 8          c   8 9          c   9

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