Estou testando o pacote "qwraps2", então estou rodando o exemplo em: https://github.com/r-lib/xml2/issues/151, conforme abaixo.

set.seed(42)
library(dplyr)
## 
## Attaching package: 'dplyr'
## The following objects are masked from 'package:stats':
## 
##     filter, lag
## The following objects are masked from 'package:base':
## 
##     intersect, setdiff, setequal, union
library(qwraps2)

# define the markup language we are working in.
# options(qwraps2_markup = "latex") is also supported.
options(qwraps2_markup = "markdown")

data(mtcars)
mtcars2 <-dplyr::mutate(mtcars, cyl_factor = factor(cyl,levels = c(6, 4, 8), labels = paste(c(6, 4, 8), "cylinders")),
                        cyl_character = paste(cyl, "cylinders"))
our_summary1 <-
  list("Miles Per Gallon" =
         list("min" = ~ min(mpg),
              "max" = ~ max(mpg),
              "mean (sd)" = ~ qwraps2::mean_sd(mpg)),
       "Displacement" =
         list("min" = ~ min(disp),
              "max" = ~ max(disp),
              "mean (sd)" = ~ qwraps2::mean_sd(disp)),
       "Weight (1000 lbs)" =
         list("min" = ~ min(wt),
              "max" = ~ max(wt),
              "mean (sd)" = ~ qwraps2::mean_sd(wt)),
       "Forward Gears" =
         list("Three" = ~ qwraps2::n_perc0(gear == 3),
              "Four"  = ~ qwraps2::n_perc0(gear == 4),
              "Five"  = ~ qwraps2::n_perc0(gear == 5))
  )
our_summary1

### Overall
summary_table(mtcars2, our_summary1)

O código foi executado com sucesso no RStudio, porém a tabela aparece como:
Screenshot from 2018-08-04 18-29-38.png
Como faço para aparecer a tabela formatada como no exemplo:
Screenshot from 2018-08-04 18-31-38.png

--
In Jesu et Maria

Obrigado
Prof. Elias Carvalho

"Felix, qui potuit rerum cognoscere causas" (Virgil 29 BC)
"Blessed is he who has been able to understand the cause of things"