写出数学表达式

写出数学表达式

如何使用方程式或对齐在乳胶中写出下面的表达式。

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编辑:根据@Henri Menke 的建议更改了措辞

答案1

非常简单stackengine

\documentclass{article}

\usepackage{amsmath}
\usepackage[usestackEOL]{stackengine} 

\begin{document}

\[ \begin{pmatrix}
  \Centerstack{Rate of heat \\ conduction \\at $x$} 
\end{pmatrix} -
 \begin{pmatrix}
  \Centerstack{Rate of heat \\ conduction \\at $x+Δx$}
\end{pmatrix} + 
\begin{pmatrix}
  \Centerstack{Rate of heat \\ generation \\ inside the \\ element} 
\end{pmatrix} =
\begin{pmatrix}
  \Centerstack{Rate of change \\ of the energy \\ content of the \\ element}
\end{pmatrix} \]%

\end{document} 

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答案2

根据您的情况确定哪一个更好。

\documentclass{article}
\usepackage{amsmath}

\begin{document}

This is the formula using words:
\begin{equation*}
\begin{pmatrix}\begin{tabular}{@{}c@{}}
Rate of heat \\ conduction \\ at $x$
\end{tabular}\end{pmatrix}
-
\begin{pmatrix}\begin{tabular}{@{}c@{}}
Rate of heat \\ conduction \\ at $x+\Delta x$
\end{tabular}\end{pmatrix}
+
\begin{pmatrix}\begin{tabular}{@{}c@{}}
Rate of heat \\ generation \\ inside the \\ element
\end{tabular}\end{pmatrix}
=
\begin{pmatrix}\begin{tabular}{@{}c@{}}
Rate of change\\ of the energy \\ content of the \\ element
\end{tabular}\end{pmatrix}
\end{equation*}

Let's denote by $R_{\mathrm{hc}}(x)$ the rate of heat conduction at~$x$, 
by $R_{\mathrm{hgi}}$ the rate of heat generation inside the element and
by $\mathit{RC}_{\mathrm{ec}}$ the rate of change of the element's energy
content. Then
\begin{equation*}
R_{\mathrm{hc}}(x)-R_{\mathrm{hc}}(x+\Delta x)+R_{\mathrm{hgi}}
=\mathit{RC}_{\mathrm{ec}}
\end{equation*}

\end{document}

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答案3

在这种情况下,像这样的新宏\newcommand{\term}[1]{\left(\begin{tabular}{@{}c@{}}#1\end{tabular}\right)}会非常方便:

\documentclass{article}

\newcommand{\term}[1]{\left(\begin{tabular}{@{}c@{}}#1\end{tabular}\right)}

\begin{document}

This is the formula using words:
\[
\term{Rate of heat\\ conduction\\ at $x$}
- \term{Rate of heat\\ conduction\\ at $x+\Delta x$}
+ \term{Rate of heat\\ generation\\ inside the\\ element} 
= \term{Rate of change\\ of the energy\\ content of the\\ element}
\]

\end{document}

在此处输入图片描述

答案4

一种解决方案是使用 TikZ 及其内部对齐来对实际上是概念自动机的内容进行口头等式(因此是大声朗读并且符号最小化);并且由于和inflow同时发生outflow,因此消除了代数算法所暗示的线性并重新排列以显示能量输入/输出同时输入到结果中。

言语等式

加上一些颜色编码,热和冷。

真正的视觉表现会有一个容器图标来容纳流动的能量(像杯子一样),一个倒入图标(像茶壶一样),一个倒出图标(像空气和茶碟一样),以及一个时间维度(动画?)。

但这不是狭义上的方程。因此,它实际上不是一个答案。

梅威瑟:

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{automata,positioning}

\begin{document}
  \begin{tikzpicture}[%
    >=stealth,
    node distance=2cm,
    on grid,
    auto
  ]
    \node[state] (A)              [align=center,fill=blue!5,text width=2cm]{Rate of heat conduction at  $x$};
    \node        (A1) [align=center,below right=of A,text width=2em]{\textit{minus}};
    \node        (B) [align=center,right= of A1,fill=green!15,text width=2cm]{Rate of heat conduction at  $x + \Delta x$};
    \node        (B1) [align=center,above right=of A,text width=2em]{\textit{plus}};
    \node        (C) [align=center,right= of B1,fill=red!5,text width=2cm]{Rate of heat generation inside the element};
    \node        (C2) [align=center, right=of A]{};
    \node        (C3) [align=center, right=of C2]{};
        \node        (C1) [align=center, right=of C3,text width=2cm]{\textit{equals}};
    \node        (C4) [align=center, right=of C1]{};
        \node        (D) [state,node distance=1cm,align=center,right= of C4,fill=blue!5,text width=2cm]{Rate of change of the energy content of the element};
      \end{tikzpicture}
\end{document}

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