有人能告诉我如何画这个图吗？你可以使用任何你想要的颜色

Question

有人能告诉我如何画这个图形吗？你可以使用任何你想要的颜色，以便 Bettie 能够理解它

Answer 1

我快速制作了一个 MWE。当然还有很多改进空间，例如，可以使用循环等来自动化很多事情，以及使用更多节点来更准确地放置文本。这只是一个快速模型。

\documentclass{article}
\usepackage{tikz}


\begin{document}
\begin{tikzpicture}

  \draw[>=latex, ->] (-1,0) -- (10,0) node[right] {$x_1$};
  \draw[>=latex, ->] (0,-1) -- (0,10) node[above] {$x_2$};

  \draw[dashed] (3,-1) -- ++(120:7);
  \draw[dashed] (4,-1) -- ++(120:9);
  \draw[dashed] (5,-1) -- ++(120:11);
  \draw[dashed] (6,-1) -- ++(120:13);

  \draw[>=latex, ->] (-1,5) -- ++(30:4) node[right] {direction of increasing $E$};

  \draw[shift={(2,3)},rotate=120] (0,0) ellipse (0.6 and 0.3);
  \draw[shift={(2,3)},rotate=120] (0,0) ellipse (0.8 and 0.5);
  \draw[shift={(2,3)},rotate=120] (0,0) ellipse (1   and 0.7);
  \draw[shift={(2,3)},rotate=120] (0,0) ellipse (1.2 and 0.9);
  \draw[shift={(2,3)},rotate=120] (0,0) ellipse (1.4 and 1.1);
  \draw[shift={(2,3)},rotate=120] (0,0) ellipse (1.6 and 1.3);
  \draw[shift={(2,3)},rotate=120] (0,0) ellipse (2 and 1.7);
  \draw[shift={(2,3)},rotate=120] (0,0) ellipse (2.5 and 2.2);

  \draw[thick] (6,0) node[below] {$b$} -- (3,3.5) -- (2,3);

  \begin{scope}[shift={(5,6)}]
  \draw[dashed] (0,0) -- ++(2,0) node[right] {isomean lines};
  \draw[thick] (0,-0.5) -- ++(2,0) node[right] {efficient portfolios};
  \draw (0,-1) -- ++(-45:1) -| (0,-1);
  \draw (2,-1.25) node[right] {attainable set};
  \draw (0.5,-2.5) ellipse (0.5 and 0.25);
  \draw (2,-2.5) node[right] {isovariance curves};
  \end{scope}

\end{tikzpicture}
\end{document}