Latex IEEETran cls use titlesec package

Question

Anyone know how to use titlesec package if I am under \documentclass[conference]{IEEEtran} ?

I got following error:

！Undefined control sequence.

<argument> \subparagraph

Thanks

Answer 1

The titlesec package assumes all of the section levels provided by the standard classes are present. This includes the subparagraph level. The IEEEtrans class doesn't define a level subparagraph so titlesec doesn't know what to do when it tries to redefine it. The simple solution is to simply add the line

\newcommand{\subparagraph}{}

to your preamble before loading the titlesec package. If you need to actually have it work, you will then need to provide its definition via the regular titlesec methods.