Hello Arash and Ikumi,

Thank you the reply and support. Apologies for not getting back earlier. So it turns out that recompiling preview latex for the entire document is required. I always previewed the file only/ buffer only. Therefore it never worked.

Best,
Sabarish.

> On 6. Mar 2024, at 21:05, Arash Esbati <arash@gnu.org> wrote:
> 
> Ikumi Keita <ikumi@ikumi.que.jp <mailto:ikumi@ikumi.que.jp>> writes:
> 
>> Hi Sabarish,
>> 
>>>>>>> Sabarish V M <sabarish.science@gmail.com> writes:
>>> The preview latex package does not render the "\newcommand" macros
>>> properly.
>> 
>>> Example,
>> 
>>> \documentclass{template}
>>> \title{Some title}
>>> \author{XXX}
>>> \begin{document}
>>> \maketitle
>> 
>>> \include{symbols} % The file contains all the macros defined
>>> % It contains,
>>> % \newcommand{\kb}{k_{\mathrm{B}}}
>>> % \renewcommand{\d}{\mathrm{d}}
>> 
>>> From classical Boltzmann statistics we know that the probability for finding any
>>> particle in a given state $i$ is,
>>> \[ \frac{N_i}{N} = \frac{\exp \left( - E_i / \kb T \right)}{Z\kb \d } \]
>>> \include{chapters/01.introduction}
>>> \include{chapters/appendix}
>> 
>>> \end{document}
>> 
>> This document doesn't typeset for me because my TeX Live 2023 doesn't
>> have "template" class. After I replaced
>> \documentclass{template}
>> with
>> \documentclass{article}
>> , I can both typeset and use preview-latex for the files quoted below.
>> Hence I suppose that the issue isn't related directly to \newcommand and
>> suspect there is something incompatible with preview-latex in
>> the non-standard class file template.cls.
>> 
>> --- foo.tex ----------------------------------------------------------
>> \documentclass{article}
>> \title{Some title}
>> \author{XXX}
>> \begin{document}
>> \maketitle
>> 
>> \include{symbols}
>> 
>> From classical Boltzmann statistics we know that the probability for finding any
>> particle in a given state $i$ is,
>> \[ \frac{N_i}{N} = \frac{\exp \left( - E_i / \kb T \right)}{Z\kb \d } \]
>> 
>> \end{document}
>> ----------------------------------------------------------------------
>> 
>> --- symbols.tex ------------------------------------------------------
>> \newcommand{\kb}{k_{\mathrm{B}}}
>> \renewcommand{\d}{\mathrm{d}}
>> 
>> %%% Local Variables:
>> %%% mode: LaTeX
>> %%% TeX-master: "foo"
>> %%% End:
>> ----------------------------------------------------------------------
> 
> No further comments, therefore I'm closing this report.  We can reopen
> if necessary.
> 
> Best, Arash