该代码是基于MATLAB语言的有限元长应变四面体的计算，包含四面体计算的完整代码，另外包含一个例子，适用方便，感谢大家的分享。 this code is a kind of constrain tetrahedron fem compution on matlab.there are an complete code and an example.it is practical and stable.thank you for your exchange.