Using Macros vs. preamble in a MathJax config file

[saf....@gmail.com]

In MathJax documentation here author(s) have defined content of a local config file (as an example) as:

Example 1:

MathJax.Hub.Config({
  TeX: {
    Macros: {
      RR: "{\\bf R}",
      bold: ["{\\bf #1}",1]
    }
  }
});

MathJax.Ajax.loadComplete("[MathJax]/config/local/local.js");

Whereas; at some other example I saw somewhere, the content of a local config file as:

Example 2:

MathJax.Hub.Config({

    TeX: {
        extensions: ["http://cs.jsu.edu/mathjax-ext/github/preamble/preamble.js"],
        preamble: [
          "\\def\\RR{\\mathbf{R}}",
          "\\def\\CC{\\mathbf{C}}"
        ]
    }
});
MathJax.Ajax.loadComplete("[MathJax]/config/local/local.js");

Question: I notice that in example 1 the same macro RR is defined differently then in example 2. a) What is the best approach b) Is preamble built-in configuration or one has to include premble.js?

[David Farmer]

I don't have an answer to your specific question, but there are
other options:

Example 3:

Put this in the body of the document:

\(
\def\RR{\mathbf{R}}

\def\CC{\mathbf{C}}
\)

Or use the "newcommand" version.

Note: it is bad/antiquated style to use \bf, but that is a
LaTeX topic which has nothing to do with MathJax.

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[Peter Krautzberger]

Hi,

> a) What is the best approach 

There's little difference. But I would always suggest to use the default.

> b) Is preamble built-in configuration or one has to include premble.js?

preamble.js is a third party contribution available via the third party extension repository, http://docs.mathjax.org/en/latest/options/ThirdParty.html#mathjax-third-party-extension-repository. In particular, we do not provide support for it.

Regards,

Peter.

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[Davide Cervone]

As Peter points out, the preamble.js file is in the third-party repository. If you are using MathJax v2.7, you should be able to use

extensions: ["[Contrib]/preamble/preamble.js"],

as the location of the file (rather than jsu.edu address). This will get you the "official" copy from the third-party repository rather than a possibly outdated copy hosted elsewhere.

Davide

[saf....@gmail.com]

I'm using MathJax v2.7 and what you suggested is what I was looking for. Thanks..Saf