# How to place 2 aligned equations next to a single graph in a table?

I want to make a table with two columns:

• on the left side, I want to put 2 aligned equations
• on the right side, I want to put a graph.

In the following MCVE, the 2 equations are on the left side but with a huge unused space between them. I want to place those 2 equation just next to the graph \documentclass[a4paper, 12pt]{book}
\usepackage{pgfplots, tikz}
\begin{document}
\begin{tabular}{cc}
$\frac{u_{i+1,j} - u_{i,j}}{\Delta t} = \kappa \frac{u_{i,j-1} - 2u_{i,j} + u_{i,j+1}}{(\Delta x)^2}$ \\
$u_{i+1,j} = u_{i,j} + \frac{\kappa \Delta t}{(\Delta x)^2}(u_{i,j-1} - 2u_{i,j} + u_{i,j+1})$
&
\begin{tikzpicture}
[scale = 0.7]
%[scale = 0.7, every node/.style={scale = 0.7}]
% Draw axes
\draw [<->,thick] (0,5) node (yaxis) [above] {$y$}
|- (5,0) node (xaxis) [right] {$x$};

\coordinate (c) at (2,2);
\fill[red] (c) circle (3pt);
\draw[dashed] (yaxis |- c) node[left] {$\scriptstyle{i}$}
-| (xaxis -| c) node[below] {$\scriptstyle{j-1}$};

\coordinate (d) at (3,2);
\fill[red] (d) circle (3pt);
\draw[dashed] (yaxis |- d) node[left] {$\scriptstyle{i}$}
-| (xaxis -| d) node[below] {$\scriptstyle{j}$};

\coordinate (d) at (3,3);
\fill[red] (d) circle (3pt);
\draw[dashed] (yaxis |- d) node[left] {$\scriptstyle{i+1}$}
-| (xaxis -| d) node[below] {$\scriptstyle{j}$};

\coordinate (d) at (4,2);
\fill[red] (d) circle (3pt);
\draw[dashed] (yaxis |- d) node[left] {$\scriptstyle{i}$}
-| (xaxis -| d) node[below] {$\scriptstyle{j+1}$};

\draw [thin, gray] (0,0) grid (5,5);
\end{tikzpicture}\\
\end{tabular}
\end{document}


I propose this somution with the equations inserted in a gathered environment,, and a \raisebox for the graph:

\documentclass[a4paper, 12pt]{book}
\usepackage{pgfplots, tikz}
\usepackage{mathtools }

\begin{document}

\begin{tabular}{cc}
\leavevmode $\begin{gathered} \frac{u_{i+1,j} - u_{i,j}}{\Delta t} = \kappa \frac{u_{i,j-1} - 2u_{i,j} + u_{i,j+1}}{(\Delta x)^2} \\ u_{i+1,j} = u_{i,j} + \frac{\kappa \Delta t}{(\Delta x)^2}(u_{i,j-1} - 2u_{i,j} + u_{i,j+1}) \end{gathered}$
&
\raisebox{-0.5\height}{\begin{tikzpicture}
[scale = 0.7]
%[scale = 0.7, every node/.style={scale = 0.7}]
% Draw axes
\draw [<->,thick] (0,5) node (yaxis) [above] {$y$}
|- (5,0) node (xaxis) [right] {$x$};

\coordinate (c) at (2,2);
\fill[red] (c) circle (3pt);
\draw[dashed] (yaxis |- c) node[left] {$\scriptstyle{i}$}
-| (xaxis -| c) node[below] {$\scriptstyle{j-1}$};

\coordinate (d) at (3,2);
\fill[red] (d) circle (3pt);
\draw[dashed] (yaxis |- d) node[left] {$\scriptstyle{i}$}
-| (xaxis -| d) node[below] {$\scriptstyle{j}$};

\coordinate (d) at (3,3);
\fill[red] (d) circle (3pt);
\draw[dashed] (yaxis |- d) node[left] {$\scriptstyle{i+1}$}
-| (xaxis -| d) node[below] {$\scriptstyle{j}$};

\coordinate (d) at (4,2);
\fill[red] (d) circle (3pt);
\draw[dashed] (yaxis |- d) node[left] {$\scriptstyle{i}$}
-| (xaxis -| d) node[below] {$\scriptstyle{j+1}$};

\draw [thin, gray] (0,0) grid (5,5);
\end{tikzpicture}}\\
\end{tabular}

\end{document} • Many thanks @Bernard. Is it possible to alignt the 2 equations? – ecjb Jan 1 '19 at 16:54
• Yes: replace gathered with aligned and add the ampersands for the alignment points. Personally I find it better-looking with gathered. Or maybe aligned on the left? – Bernard Jan 1 '19 at 17:00