关于matcont symbolically选项的疑问

kangarooli

请问matcont中关于这一栏是如何选择的呢，如下图所标
这下面英文应该是它的描述，可是看不懂怎么回事，哪位明白还请指点下，十分感谢
  The appearance of the System window depends on the presence of the Matlab
symbolic toolbox. If it is present, then we have the option to compute derivatives
of the object function by marking the dots in the line’symbolically’.If the Matlab
symbolic toolbox is not installed then the line ’symbolically’ is replaced by the
line ’from file’. This means that we can define derivatives by a file which may
have been generated by a symbolic package, e.g. Maple.
  We can also mark dots in the line ’from window’; this will open additional
windows where we can input explicit formulas for the derivatives of the object
function. If none of these options are chosen, then derivatives are computed
’numerically’, i.e. by finite differences

铁锅

如果你安装了matlab symbolic toolbox,行symbolically就会出现，你可以选择它计算各阶导数，否则这行不出现，而是出现“from file”,这时，你可以自己用文件保存计算导数的方法，指定它就可以。

electronic2012

回复 2 # 铁锅 的帖子

您好！能不能帮我解决一下问题，我的问题是：每当选择Hopf分岔点后，计算是总会显示Error using==>get
    Invalid handle object.
我按照Limit cycles and their bifurcations in MatCont这篇文章一步一步做得，可是每次到这里总会出错。