i'm studying SMath with Maxima (written by Dr. Kraska)
today i studying piechart_description.
in this case how should i make pidigits.data?
No need to create it. It comes as sample data with the package "descriptive" in Maxima. Note that with Maxima 5.47 you'lL get a wrong piechart because of a bug in the ellipse graphics object. With 5.45 it works.
Technische Mechanik mit SMath Studio: https://link.springer.com/book/10.1007/978-3-658-50592-9