I opened RStudio and created R Notebook. It contained the default content automatically generated and contained one graph obtained from plot(cars). Then I clicked Knit to HTML.
The yml changed from
title: "R Notebook"
output: html_notebook
to
title: "R Notebook"
output:
html_document:
df_print: paged
In the folder where the code was located, two files were generated, .html and .nb.html.
.html contained the plot, but .nb.html does not contain the plot.
I pasted the <img src="data:image/ from the source code of .nb.html to an empty html file. The graph appeared.
Could anyone know why this happened and how to show graphs in .nb.html? Thank you.