Tente executar este código removendo um por um de cada \pgfplotstablegetelem. Você verá que os 2 subflutuadores se moverão passo a passo em direção ao centro. Por que? Mantendo todos eles o resultado é o seguinte. Preciso manter \newcommandassim, mas ao mesmo tempo a figura centralizada, como posso fazer?
\documentclass[a4paper,twoside,12pt]{book}
\usepackage[T1]{fontenc}
\usepackage[utf8x]{inputenc}
\usepackage[english]{babel}
\usepackage{tikz}
\usepackage{pgfplotstable, filecontents}
\usepackage{subfig}
\usepackage{float}
\newcommand{\iso}[1]{
\pgfplotstablegetelem{#1}{T}\of{coefficienti.dat}
\pgfmathsetmacro{\T}{\pgfplotsretval}
\pgfplotstablegetelem{#1}{K}\of{coefficienti.dat}
\pgfmathsetmacro{\K}{\pgfplotsretval}
\pgfplotstablegetelem{#1}{Q}\of{coefficienti.dat}
\pgfmathsetmacro{\Q}{\pgfplotsretval}
\pgfplotstablegetelem{#1}{Kf}\of{coefficienti.dat}
\pgfmathsetmacro{\Kf}{\pgfplotsretval}
\pgfplotstablegetelem{#1}{n}\of{coefficienti.dat}
\pgfmathsetmacro{\n}{\pgfplotsretval}
\pgfplotstablegetelem{#1}{Klf}\of{coefficienti.dat}
\pgfmathsetmacro{\Klf}{\pgfplotsretval}
\pgfplotstablegetelem{#1}{Qlf}\of{coefficienti.dat}
\pgfmathsetmacro{\Qlf}{\pgfplotsretval}
\pgfplotstablegetelem{#1}{m}\of{coefficienti.dat}
\pgfmathsetmacro{\m}{\pgfplotsretval}
\begin{tikzpicture}
\begin{axis}[
width=7cm,
domain=0:1,
xlabel=$Equilibrium$,
ylabel=$Sorbed$,
legend style={draw=none, at={(.9,.3)}}]
\end{axis}
\end{tikzpicture}
}
\begin{document}
\begin{filecontents*}{coefficienti.dat}
T K Q Kf n Klf Qlf m
400 0.0463 32.9 5.78 0.321 .0840 40.7 .675
500 0.154 23.8 6.33 0.281 .0722 86.8 .354
600 0.115 24.6 6.30 0.261 .0257 247 .280
700 1.68 24.2 12.1 0.153 .9760 32.0 .376
\end{filecontents*}
\begin{figure}[H]
\centering
\subfloat[]{\iso{0}}
\subfloat[]{\iso{0}}
\caption{This caption is centered, but not the 2 subfloats}
\end{figure}
\end{document}
Responder1
Você tem um bom suprimento de espaços de fim de linha. Coloque %no final das linhas, à vontade.
\documentclass[a4paper,twoside,12pt]{book}
\usepackage[T1]{fontenc}
\usepackage[utf8x]{inputenc}
\usepackage[english]{babel}
\usepackage{tikz}
\usepackage{pgfplotstable, filecontents}
\usepackage{subfig}
\usepackage{float}
\newcommand{\iso}[1]{%
\pgfplotstablegetelem{#1}{T}\of{coefficienti.dat}%
\pgfmathsetmacro{\T}{\pgfplotsretval}%
\pgfplotstablegetelem{#1}{K}\of{coefficienti.dat}%
\pgfmathsetmacro{\K}{\pgfplotsretval}%
\pgfplotstablegetelem{#1}{Q}\of{coefficienti.dat}%
\pgfmathsetmacro{\Q}{\pgfplotsretval}%
\pgfplotstablegetelem{#1}{Kf}\of{coefficienti.dat}%
\pgfmathsetmacro{\Kf}{\pgfplotsretval}%
\pgfplotstablegetelem{#1}{n}\of{coefficienti.dat}%
\pgfmathsetmacro{\n}{\pgfplotsretval}%
\pgfplotstablegetelem{#1}{Klf}\of{coefficienti.dat}%
\pgfmathsetmacro{\Klf}{\pgfplotsretval}%
\pgfplotstablegetelem{#1}{Qlf}\of{coefficienti.dat}%
\pgfmathsetmacro{\Qlf}{\pgfplotsretval}%
\pgfplotstablegetelem{#1}{m}\of{coefficienti.dat}%
\pgfmathsetmacro{\m}{\pgfplotsretval}%
\begin{tikzpicture}%
\begin{axis}[
width=7cm,
domain=0:1,
xlabel=$Equilibrium$,
ylabel=$Sorbed$,
legend style={draw=none, at={(.9,.3)}}]
\end{axis}%
\end{tikzpicture}%
}
\begin{document}
\begin{filecontents*}{coefficienti.dat}
T K Q Kf n Klf Qlf m
400 0.0463 32.9 5.78 0.321 .0840 40.7 .675
500 0.154 23.8 6.33 0.281 .0722 86.8 .354
600 0.115 24.6 6.30 0.261 .0257 247 .280
700 1.68 24.2 12.1 0.153 .9760 32.0 .376
\end{filecontents*}
\begin{figure}[H]
\centering
\subfloat[]{\iso{0}}
\subfloat[]{\iso{0}}
\caption{This caption is centered, but not the 2 subfloats}
\end{figure}
\end{document}
Observe que isso width=7cmé demais para caber. Use width=0.5\linewidthem vez disso.
