# Undefined Control Sequence Latex Using R

Sheeraz Gul Aug 31, 2022

This tutorial demonstrates the undefined control sequence latex error in R.

## Undefined Control Sequence Latex Using R

When we use Latex with R, the undefined control sequence latex error will occur when there is a syntax error or typo mistake in the Latex syntax.

Usually, sometimes we need to put some R code between the Latex, and that file is saved with the Rtex extension.

The common cause for this error is a typo mistake; for example, when writing the Greek letter $\alpha$ but we made a typing mistake like $\slpha$, it will throw the undefined control sequence latex error. Let’s try an example.

\documentclass{article}
\begin{document}

Let's use R commands in our \LaTeX{} document which will be processed and output will be included in the document:

$$\slpha$$

<<>>=
# Use R to create a sequence of numbers
a = 1:100

# Use R to display basic statistical measures
summary(a)

@
\end{document}


After running the code above, the Latex screen will show the output without the \alpha, and it will also show the undefined control sequence error in the log. See output:

The Latex document:

The log file:

To solve this error, we must write the Latex syntax correctly and make sure there are no typo mistakes. This applies to using R in Latex or using Latex in R.

Let’s see the solution.

\documentclass{article}
\begin{document}

Let's use R commands in our \LaTeX{} document which will be processed and output will be included in the document:

$$\alpha$$

<<>>=
# Use R to create a sequence of numbers
a = 1:100

# Use R to display basic statistical measures
summary(a)

@
\end{document}


When the only typing mistake is corrected, the undefined control sequence latex will be solved. See output:

Author: Sheeraz Gul

Sheeraz is a Doctorate fellow in Computer Science at Northwestern Polytechnical University, Xian, China. He has 7 years of Software Development experience in AI, Web, Database, and Desktop technologies. He writes tutorials in Java, PHP, Python, GoLang, R, etc., to help beginners learn the field of Computer Science.