How can I undefine an environment?

Question

This is how to undefine a command:

\newcommand\foo
\makeatletter
\let\foo\@undefined
\makeatother

I need to undefine the spacing environment from the setspace package. This does not seem to work:

\usepackage{setspace}
\makeatletter
\let\beginspacing\@undefined
\let\endspacing\@undefined    
\makeatother

egreg · Accepted Answer · 2013-12-15 21:56:03Z

16

The macro \newenvironment{foo} defines the two macros

\foo
\endfoo

not \beginfoo.

Rather than undefine spacing, you could simply make it a noop:

\renewenvironment{spacing}{}{}

This is preferable because it will keep track of nested environments.

answered Dec 15, 2013 at 21:56

egreg

1.1m132 gold badges2569 silver badges4137 bronze badges

What is an environment needs to be undefined, because it was predefined but conflicts with some package? Is there a better way than going through \makeatletter?
– Alexey
Jun 4, 2020 at 14:45
@Alexey Where do you get to undefine the environment?
– egreg
Jun 4, 2020 at 15:01
In my own class i defined an environment, and then i loaded a package that defines an environment with the same name :). I do not want to change my class, usually it is fine.
– Alexey
Jun 4, 2020 at 15:03
@Alexey It mostly depends on which of the two conflicting definitions you want to keep.
– egreg
Jun 4, 2020 at 15:04
I wanted to keep the one coming from a package (not mine).
– Alexey
Jun 4, 2020 at 21:22

| Show 3 more comments

Paul Wintz · Accepted Answer · 2022-11-02 00:48:17Z

1

\let\spacing\@undefined
\let\endspacing\@undefined

to undefine the spacing environment. Note that \@undefined is not a special command, it simply is, itself, undefined.

answered Nov 2, 2022 at 0:48

Paul Wintz

2292 silver badges12 bronze badges

Add a comment |

2 Answers 2