[Tex/LaTex] How to automatically align subfloat captions to xlabel of PGFplots

horizontal alignmentpgfplotssubcaptionsubfloatstikzscale

Subfloat captions are not usually aligned with their corresponding xlable in PGFplots.
enter image description here
enter image description here

One way is to manually move the captions horizontally to align them. For example, (copied from here)

\documentclass{article}
\usepackage{subfig}
\usepackage[demo]{graphicx}
\begin{document}
\begin{figure}
  \centering
  \captionsetup[subfigure]{oneside,margin={2cm,0cm}}
  \subfloat[]{\includegraphics[width=4cm]{test1}}
  \hspace{1cm}
  \subfloat[]{\includegraphics[width=4cm]{test1}}
  \caption{Caption text}
\end{figure}
\end{document}

However, this process would be tedious if there are too many figures in the document each requiring separate alignment.

Is there any possible way to automatically align subcaptions to (detect if any and) center to their x axis o PGFplots?

EDIT:

Using tikzscale to resize the figures.

\documentclass{article}
\usepackage{subfig}
\usepackage{pgfplots}
\usepackage{tikzscale}
\begin{document}
\begin{figure}
  \centering
  \captionsetup[subfigure]{oneside}
  \subfloat[]{ %
    \includegraphics[width=5cm,height=4cm]{plot1.tikz}
  }%
  \hspace{1cm}
  \subfloat[]{%
    \includegraphics[width=5cm,height=4cm]{plot2.tikz}
  }
  \caption{Caption text}
\end{figure}
\end{document}

where plot1.tikz is:

  \begin{tikzpicture}[]
  \begin{axis}[
    xlabel=$x$,
    ylabel={$f(x) = x^2 - x +4$}
  ]
  \addplot {x^2 - x +4};
  \end{axis}
  \end{tikzpicture}%

and plot2.tikz :

  \begin{tikzpicture}[]
  \begin{axis}[
    xlabel=$x$,
    ylabel=$\sin(x)$
  ]
  \addplot {sin(deg(x))};
  \end{axis}
  \end{tikzpicture}%

The result will be:
enter image description here

Best Answer

You can use the options trim axis left and/or trim axis right for tikzpicture:

\documentclass{article}
\usepackage{subfig}
\usepackage{pgfplots}

\begin{document}
\begin{figure}
  \centering
  \captionsetup[subfigure]{oneside}
  \subfloat[]{%
  \begin{tikzpicture}[trim axis left,trim axis right]
  \begin{axis}[
    xlabel=$x$,
    ylabel={$f(x) = x^2 - x +4$},
    width=5cm
  ]
  \addplot {x^2 - x +4};
  \end{axis}
  \end{tikzpicture}%
  }%
  \hspace{2cm}
  \subfloat[]{%
  \begin{tikzpicture}[trim axis left,trim axis right]
  \begin{axis}[
    xlabel=$x$,
    ylabel=$\sin(x)$,
    width=5cm
  ]
  \addplot {sin(deg(x))};
  \end{axis}
  \end{tikzpicture}%
  }
  \caption{Caption text}
\end{figure}
\end{document}

enter image description here

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