擅长:python、mysql、java
<p>我不确定使用0.6.7是否有问题,但建议更新到0.7.1。</p>
<p>当我看<code>stiff</code>时,我看不出<code>meSubs</code>中的替代是有用的。在创建<code>stiff</code>之后,我执行了以下操作:</p>
<pre><code>stiff.simplify()
stiff = stiff.subs({2*nuxz**2: 1 - nuxy - m})
stiff = stiff.applyfunc(lambda x: together(expand(x)))
pprint(stiff)
</code></pre>
<p>输出还不错:</p>
^{pr2}$
<p>展开:<a href="http://docs.sympy.org/0.7.1/modules/core.html?highlight=expand#sympy.core.function.expand" rel="nofollow">http://docs.sympy.org/0.7.1/modules/core.html?highlight=expand#sympy.core.function.expand</a></p>
<p>一起:<a href="http://docs.sympy.org/0.7.1/modules/polys/reference.html?highlight=together#sympy.polys.rationaltools.together" rel="nofollow">http://docs.sympy.org/0.7.1/modules/polys/reference.html?highlight=together#sympy.polys.rationaltools.together</a></p>