This is an R HTML document. When you click the Knit HTML button a web page will be generated that includes both content as well as the output of any embedded R code chunks within the document. You can embed an R code chunk like this:

library(png)
library(jpeg)
library(grid)
library(gridExtra)
img1 <-  rasterGrob(as.raster(readJPEG("pc_thermal.jpg")), interpolate = FALSE)
img2 <-  rasterGrob(as.raster(readJPEG("pc_thermal.jpg")), interpolate = FALSE)
grid.arrange(img1,
             img2,
             ncol = 2)
plot of chunk unnamed-chunk-1
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

You can also embed plots, for example:

plot(cars)
plot of chunk unnamed-chunk-2