r - Knitr and kable not finding data frame -

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i attempting show simple table in knitr on word document. have following code:

library(knitr) a<-c(1,2,3,4,5,6) b<-c(1,2,3,4,5,6) tab<-data.frame(a,b)

in console runs correctly

knitr::kable(tab)

however when put markdown documents called 'medinventory' code not run , returns following error:

````{r echo=false,results='asis'} knitr::kable(tab) ````    processing file: medinventory.rmd |......................                                           |  33% ordinary text without r code  |...........................................                      |  67% label: unnamed-chunk-1 (with options)  list of 2 $ echo   : logi false $ results: chr "asis"   quitting lines 17-18 (medinventory.rmd)  error in is.data.frame(x) : object 'tab' not found calls: <anonymous> ... eval -> eval -> <anonymous> -> colnames ->                               is.data.frame execution halted

so data frame in globalenvr not recognized markdown? appreciate links related questions answer.

thanks @molx answer, , @d.mercer comments. in markdown code.

```{r echo=false,results='asis'} library(knitr) a<-c(1,2,3,4,5,6) b<-c(1,2,3,4,5,6) tab<-data.frame(a,b) knitr::kable(tab) ```

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