我在latex里面写的公式如下:
\begin{align}
& \mathbf{R}=\left[ \begin{matrix}
{{{\hat{X}}}_{1,1}} & \cdots & {{{\hat{X}}}_{i,1}} & \cdots & {{{\hat{X}}}_{m/K,1}} \\
\vdots & {} & \vdots & {} & \vdots \\
{{{\hat{X}}}_{1,d}} & \cdots & {{{\hat{X}}}_{i,d}} & \cdots & {{{\hat{X}}}_{m/K,d}} \\
\end{matrix} \right]\odot \left[ \begin{matrix}
{{s}_{1}} & \cdots & {{s}_{i}} & \cdots & {{s}_{m/K}} \\
\vdots & {} & \vdots & {} & \vdots \\
{{s}_{1}} & \cdots & {{s}_{i}} & \cdots & {{s}_{m/K}} \\
\end{matrix} \right] \\
& =\left[ \begin{matrix}
{{s}_{1}}{{{\hat{X}}}_{1,1}} & \cdots & {{s}_{i}}{{{\hat{X}}}_{i,1}} & \cdots & {{s}_{m/K}}{{{\hat{X}}}_{m/K,1}} \\
\vdots & {} & \vdots & {} & \vdots \\
{{s}_{1}}{{{\hat{X}}}_{1,d}} & \cdots & {{s}_{i}}{{{\hat{X}}}_{i,d}} & \cdots & {{s}_{m/K}}{{{\hat{X}}}_{m/K,d}} \\
\end{matrix} \right]
\end{align}
我试了\setlength{\arraycolsep}{0.5pt}和% \renewcommand*{\arraystretch}{.5}都变化,该怎么调小列间距?