Ecco ho provato. Sia con subfig che con una semplice figure.
`\begin{figure}
\centering
\subfloat[][]{
\begin{tikzpicture}[font=\small]
\begin{axis} [width=0.7\textwidth,
axis lines=middle,
xmin=-5,xmax=5,ymin=0,ymax=16,
enlargelimits,
xtick={-4,…,4},
ytick={0,…,16},
xlabel=$x$,
ylabel=$y$]
\addplot [domain=-4:4, samples=100,smooth,very thick,blue] {2^x};
\addplot [only marks, samples at={-4,-3,-2,-1,0,1,2,3,4}, blue] {2^x};
\end{axis}
\end{tikzpicture}
}
\quad
\subfloat[][]{
\begin{tabular}{rl}
\toprule
$x$ & $y=2^x$ \\
\midrule
$-4$ & $2^{-4} = 1/16$ \\
$-3$ & $2^{-3} = 1/8$ \\
$-2$ & $2^{-2} = 1/4$ \\
$-1$ & $2^{-1}= 1/2$ \\
$0$ & $2^0 = 1$ \\
$1$ & $2^1 = 2$ \\
$2$ & $2^2 = 4$ \\
$3$ & $2^3 = 8$ \\
$4$ & $2^4 = 16$ \\
\bottomrule
\end{tabular}
}
\caption{La funzione $y=2^x$.}
\end{figure}`
`\begin{figure}
\centering
\begin{tikzpicture}[font=\small]
\begin{axis} [width=0.8\textwidth,
axis lines=middle,
xmin=-5,xmax=5,ymin=0,ymax=16,
enlargelimits,
xtick={-4,…,4},
ytick={0,…,16},
xlabel=$x$,
ylabel=$y$]
\addplot [domain=-4:4, samples=100,smooth,very thick,blue] {2^x};
\addplot [only marks, samples at={-4,-3,-2,-1,0,1,2,3,4}, blue] {2^x};
\end{axis}
\end{tikzpicture}
%
\quad
%
\begin{tabular}{rl}
\toprule
$x$ & $y=2^x$ \\
\midrule
$-4$ & $2^{-4} = 1/16$ \\
$-3$ & $2^{-3} = 1/8$ \\
$-2$ & $2^{-2} = 1/4$ \\
$-1$ & $2^{-1}= 1/2$ \\
$0$ & $2^0 = 1$ \\
$1$ & $2^1 = 2$ \\
$2$ & $2^2 = 4$ \\
$3$ & $2^3 = 8$ \\
$4$ & $2^4 = 16$ \\
\bottomrule
\end{tabular}
\caption{La funzione $y=2^x$.}
\end{figure}`
Non capisco: perché l’allineamento viene così sballato? 🙁