r - Control alignment of two side-by-side plots in knitr -

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i cannot figure out how arrange 2 side-by-side plots explained in knitr graphics manual page 2 (http://yihui.name/knitr/demo/graphics/). use following mwe , output below. them aligned shown in manual 2 cars plots (also on page 2 of manual). pdf generated in rstudio (knit pdf).

--- title: "untitled" output: pdf_document ---  ## r markdown  ```{r,echo=false,out.width='.49\\linewidth', fig.width=3, fig.height=3}  barplot(1:4) barplot(4:7)  ```

enter image description here

to center 2 plots can add fig.align='center'to chunk options. if produces 1 plot above other add fig.show='hold'. result should 2 centered graphs. result

so final chunk option should like:

{r,echo=false, out.width='.49\\linewidth', fig.width=3, fig.height=3,fig.show='hold',fig.align='center'}

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