How can I set the toc depth so that chapter's numbering follows part's numbering?

Question

I use the documentclass[twoside,11pt]{book}.

My current document yields something like this :

PART 1

Chapter 1

Section 1.1

Chapter 2

Section 2.1

PART 2

Chapter 3
Chapter 4
...

Instead, what I am trying to do is something like this:

PART 1

Chapter 1.1

Section 1.1.1

Chapter 1.2

Section 1.2.1

PART 2

Chapter 2.1
Chapter 2.2
...

Is there an easy way to do so ?
Thank you for your help.

Peter Wilson · Answer

You tell us what you get but not how you get it. You obviously use your own code for changing the ToC layout. Basically I assume that you are just asking about changing the divisional numbering scheme.

% partchapprob.tex SE 545742
documentclass{book}

renewcommand{thechapter}{thepart.arabic{chapter}}
begin{document}
tableofcontents
part{One}
chapter{First}
section{A section}
chapter{Second}
section{Another section}
part{Two}
chapter{Ctitle}
section{Stitle}
end{document}

In the above MWE the redefinition of the chapter number gives what I think you are after.

It is hard trying to answer a question when you don't know what has been done. --- GOM

How can I set the toc depth so that chapter's numbering follows part's numbering?

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