Programmatically creating Markdown tables in R with KnitR

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Now knitr (since version 1.3) package include the kable function for a creation tables:

> library(knitr)
> kable(head(iris[,1:3]), format = "markdown")
|  Sepal.Length|  Sepal.Width|  Petal.Length|
|-------------:|------------:|-------------:|
|           5,1|          3,5|           1,4|
|           4,9|          3,0|           1,4|
|           4,7|          3,2|           1,3|
|           4,6|          3,1|           1,5|
|           5,0|          3,6|           1,4|
|           5,4|          3,9|           1,7|

UPDATED: if you get raw markdown in a document try setup results = "asis" chunk option.

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