R Markdown

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include Shiny App

knitr::include_app("https://mikenguyen.shinyapps.io/first-app/", height = "100%")

Or you can embed directly as iframe.
But remember to include runtime: shiny in the YAML metadata

<iframe height="800" width="100%" title="first app" name="first app" allowfullscreen="true" loading="eager" scrolling="auto"  style="border:none;" src="https://mikenguyen.shinyapps.io/first-app/"></iframe>

You can embed an R code chunk like this:

summary(cars)
##      speed           dist       
##  Min.   : 4.0   Min.   :  2.00  
##  1st Qu.:12.0   1st Qu.: 26.00  
##  Median :15.0   Median : 36.00  
##  Mean   :15.4   Mean   : 42.98  
##  3rd Qu.:19.0   3rd Qu.: 56.00  
##  Max.   :25.0   Max.   :120.00
fit <- lm(dist ~ speed, data = cars)
fit
## 
## Call:
## lm(formula = dist ~ speed, data = cars)
## 
## Coefficients:
## (Intercept)        speed  
##     -17.579        3.932

Including Plots

You can also embed plots. See Figure 1 for example:

par(mar = c(0, 1, 0, 1))
pie(c(280, 60, 20), c("Sky", "Sunny side of pyramid", "Shady side of pyramid"), col = c("#0292D8", 
    "#F7EA39", "#C4B632"), init.angle = -50, border = NA)

Figure 1: A fancy pie chart.