How to use pass variables in rmarkdown pdf? - r

Question

I'm trying to pass variables to rmarkdown report as params but i'm not able to render it in the report
the below one is my code the my_value param is dataframe having only single row
---
title
output:
pdf_document: default
output:
pdf_document:
keep_tex: true
classoption: svgnames
header-includes:
- \usepackage{amsfonts,amssymb,amsmath}
params:
my_class:"smile"
my_value: data$percent
--
`r params$my_value` is the total percentage of customers
`r params$my_class` is product which has been doing better

Answer 1

The YAML header you're using isn't valid.
title tag should finish by : and have a value : title: "test"
output should only be used once
finish header with ---
Try:
---
title: "test"
output:
pdf_document:
keep_tex: true
header-includes:
- \usepackage{amsfonts,amssymb,amsmath}
classoption: svgnames
params:
my_class: "smile"
my_value: NA
---
Regarding parameters, you can't directly use data$percent as parameter value in YAML header.
Knitting is done in a new environment, data$percent doesn't exist in it.
In YAML, you could use following settings:
params:
my_class:"smile"
my_value: NA
In calling script:
# data definition
data <- ...
params <- list(
my_class = "more smiles",
my_value = data$percent
)
rmarkdown::render("MyDocument.Rmd", params = params)
For more information : https://bookdown.org/yihui/rmarkdown/params-knit.html