擅长:python、mysql、java
<p>Sage会这样做:</p>
<pre><code>x,y = var("x y")
eq = y^3-3*y-x
p = implicit_plot(eq==0,(x,-4,4),(y,-4,4))
p += plot_slope_field(eq, (x,-4,4),(y,-4,4), headlength=1e-8)
p.show(aspect_ratio=1)
</code></pre>
<p>尽管它只是包装了图形的matplotlib功能。(老实说,matplotlib包装还没有达到预期的效果,这常常让我头疼。)</p>
<p><img src="https://i.stack.imgur.com/CcRpa.png" alt="example"/></p>