# Undefined Control Sequence Latex Using R

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:
\begin{equation}
\slpha
\end{equation}
<<>>=
# 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:
\begin{equation}
\alpha
\end{equation}
<<>>=
# 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: