using subfiles package and input at the same time

Question

I want to call some files in folders. So I have 3 files : 1. main.tex (in the root) 2. commands.tex (in ./chapters) 3. control1.tex (in ./chapters) These files contains below codes: main:

\documentclass{report}
\usepackage{subfiles}
\input{chapters/commands}

\begin{document}

\subfile{./chapters/control1.tex}

\end{document}

commands:

\usepackage{graphicx}

control1:

\documentclass[../main.tex]{subfiles}
\begin{document}
\chapter{Control }
\section{intro}
some text
\end{document}

When I run main.tex everything looks good and without error. But if I run control1.tex I got this error:

It should be mentioned that without commands it runs perfect. What should I do? My goal is to put commands line in separate file.

Answer 1

I am just turning my comment into an answer, since it solved OP's issue.

The problem is that when the file in ./chapters folder is compiled, it cannot find a file in folder ./chapters/commands.tex, since this is the path relative to main.tex file. I had the same problem while organising the files for my thesis: the easiest solution is to keep all the subfiles and the main file in the same directory - in this way the relative path is the same for every file, and \input should work properly.

If this is not possible, one may want to try the solution given in this answer by Heiko Oberdiek: https://tex.stackexchange.com/a/79060/74960 .

Answer 2

If using \subfile one has to set the subfile up as

\documentclass[../main.tex]{introduction}
\begin{document}
  % content The first line is needed, for the compiler
  % This way it knows where the main.tex lays.
  % The subfile does not require any header.
  % introduction.tex uses the main.tex header
\end{document}

in main.tex include it as \subfile{Subfiles/01_introduction/introduction}

+This way one can compile from within the subfile, because the dependencies are explicit. I suggest that, because this way one can achieve clarity.

One could use a single folder per chapter containing all additional information regarding that chapter such as photos or graphs, respectively.

Answer 3

One possible solution is to not inherit the document class and settings of main.tex in ./chapters/control1.tex.Instead you can define the documentclass and preamble in control1.tex itself.
In file chapter/control1.tex instead of inheriting(1st line):

\documentclass[../main.tex]{subfiles}

\begin{document}
\chapter{Control }
\section{intro}
some text
\end{document}

Change it to:

\documentclass{report}
\usepackage{subfiles}

%rest is same
\begin{document}
\chapter{Control }
\section{intro}
some text
\end{document}