Varying style for chapter-references

Question

I would like to refer to a chapter (roman numbering) partly with arabic numerals (e.g. as part of equation numbers) and partly with roman numerals (e.g. when refering directly to the chapter) ...

I've tried sth like:

\newcommand{\chapref}[1]{\def\thechapter{\roman{chapter}}\ref{#1}}

(this changed the counter format globally)

or

\newcommand{\chapref}[1]{\uppercase\expandafter{\romannumeral \ref{#1}}}

(in may case: compiled without warning but no effect..)

but this didn't work out ... any ideas?

Answer 1

The command

\def\thechapter{\roman{chapter}}

switches the default chapter numbering to roman numerals. You should do this once, at the start. To use arabic numbers in the equation numbers, define these, too:

\def\theequation{\arabic{chapter}.\arabic{equation}}