  This paper proposes a procedure to execute external source codes from a LaTeX
document and include the calculation outputs in the resulting Portable Document
Format (pdf) file automatically. It integrates programming tools into the LaTeX
writing tool to facilitate the production of reproducible research. In our
proposed approach to a LaTeX-based scientific notebook the user can easily
invoke any programming language or a command-line program when compiling the
LaTeX document, while using their favorite LaTeX editor in the writing process.
The required LaTeX setup, a new Python package, and the defined preamble are
discussed in detail, and working examples using R, Julia, and MatLab to
reproduce existing research are provided to illustrate the proposed procedure.
We also demonstrate how to include system setting information in a paper by
invoking shell scripts when compiling the document.
