1. ---
    2. title: "test"
    3. author: "Peng"
    4. date: "`r format(Sys.time(), '%d %B, %Y')`"
    5. output: 
    6.   html_document:
    7.     toc: True
    8.     toc_float:
    9.       collapsed: false
    10. ---
    12. ```{r setup, include=FALSE}
    13. knitr::opts_chunk$set(echo = TRUE)
    14. knitr::opts_chunk$set(warning = F)
    15. knitr::opts_chunk$set(message  = F)

    ```