This package provides a macro \setsecnum to format section numbering intuitively.

One can simply use \setsecnum{A,:1.i} to set the section numbering format as Alph for the sections, arabic for the subsections and arabic.roman for the subsubsections and the secnumdepth and tocdepth will be 3.

If one want to set the tocdepth manually, there is an option tocdep for it.

One may notice that the comma , plays a special role in the numbering format: the shallower section levels will not be shown in titles of deeper levels, but it will appear in reference labels.

The installation is the same as usual Tex packages.

0. Put the source file secnum.dtx in a empty folder and go to there.

1. Run the following to create the package file secnum.sty (as well as this file README.md)

   pdfTeX secnum.dtx
   

2. Move the following file into proper directories searched by TeX. The recommended directory is

   tex/latex/secnum
   

3. To produce the documentation run the following

   pdfLaTeX secnum.dtx
   

4. The recommended directory for the documentation is

   doc/latex/secnum
   

One can also download the generated files from the github release.