## Introduction

Today, I will be talking about how to generate a nice pdf report with text, code, plots, and formulas using R markdown.

For those of you who are in a hurry, you will find the entire code at the end of this post. Simply skip to Step 2 to learn how to convert it into pdf.

Once again, I will explain how to do this in command line. Because why would anyone need graphical interfaces when they have Vim ?

## Step 1 : Create a basic .Rmd file

Save the following lines in a file named, say, “my_report.Rmd” :

--- title: "My PDF Report with R Markdown" author: - First Name, Last Name output: pdf_document fontsize: 12pt ---

## Step 2 : Convert .Rmd -> PDF

Command line in the same directory

**>> Rscript -e “rmarkdown::render(‘./my_report.Rmd’)” **

You sould find a file named my_report.pdf in the same directory.

The file should look like this :

## Step 3 : Add some text, and a formula

Simple Linear Regression : $$ \begin{aligned} &X \beta &&= Y \\ \implies &X^{T} X \beta &&= X^{T} Y \\ \end{aligned} $$

Formulas are written using LaTex formatting.

## Step 4 : Add some R code, and a plot

Here is some R code : ```{r} # Define the cars vector with 5 values cars <- c(1, 3, 6, 4, 9) # Graph cars using blue points overlayed by a line plot(cars, type="o", col="blue") # Create a title with a red, bold/italic font title(main="Autos", col.main="red", font.main=4) ```

More “generic” plot ideas here.

## Step 5 : Change the plot size

In the above code, change

```{r}

for

```{r, fig.width=8, fig.height=4}

## Step 5 : Summary

Here is the entire sample code and the resulting PDF you can expect to have.

--- title: "My PDF Report with R Markdown" author: - My Name output: pdf_document fontsize: 12pt --- Simple Linear Regression : $$ \begin{aligned} &X \beta &&= Y \\ \implies &X^{T} X \beta &&= X^{T} Y \\ \end{aligned} $$ Here is some R code : ```{r, fig.width=8, fig.height=4} # Define the cars vector with 5 values cars <- c(1, 3, 6, 4, 9) # Graph cars using blue points overlayed by a line plot(cars, type="o", col="blue") # Create a title with a red, bold/italic font title(main="Autos", col.main="red", font.main=4)