r - Grouping names for table column headings in RMarkdown for Word/docx output -


i want group column names in rmarkdown table word/docx output.

using pandoc.table:

library(pander) pandoc.table(mtcars[1:3, 1:4], style = "rmarkdown")   |                |  mpg  |  cyl  |  disp  |  hp  | |:-------------------:|:-----:|:-----:|:------:|:----:| |    **mazda rx4**    |  21   |   6   |  160   | 110  | |  **mazda rx4 wag**  |  21   |   6   |  160   | 110  | |   **datsun 710**    | 22.8  |   4   |  108   |  93  | 

this produces output below, fine

rmarkdown output

but, want group mpg & cyl in 1 group, , disp & hp in (modified hand):

|                     |     group1    |     group2    | |:-------------------:|:-------------:|:-------------:| |                |  mpg  |  cyl  |  disp  |  hp  | |:-------------------:|:-----:|:-----:|:------:|:----:| |    **mazda rx4**    |  21   |   6   |  160   | 110  | |  **mazda rx4 wag**  |  21   |   6   |  160   | 110  | |   **datsun 710**    | 22.8  |   4   |  108   |  93  | 

this won't work , output looks this:

modified rmarkdown output

if possible, add title in merged top cell, (obviously not work):

|**table 1.** table title ..........xxxxxx  | |possibly wrapped next line.                   | |:---------------------------------------------------:| |                     |     group1    |     group2    | |:-------------------:|:-------------:|:-------------:| |                |  mpg  |  cyl  |  disp  |  hp  | |:-------------------:|:-----:|:-----:|:------:|:----:| |    **mazda rx4**    |  21   |   6   |  160   | 110  | |  **mazda rx4 wag**  |  21   |   6   |  160   | 110  | |   **datsun 710**    | 22.8  |   4   |  108   |  93  | 


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