中文说明：一个50行的matlab有限元程序（二维非线性问题），执行fem2d_nonlinear.m即可。
English Description：
A 50 line matlab finite element program (two-dimensional nonlinear problems) is implemented_ Nonlinear. M is enough.
Matlab finite element program with 50 lines
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中文说明：一个50行的matlab有限元程序（二维非线性问题），执行fem2d_nonlinear.m即可。
English Description：
A 50 line matlab finite element program (two-dimensional nonlinear problems) is implemented_ Nonlinear. M is enough.fem2d_nonlinear_50line
......................\coordinates.dat
......................\dirichlet.dat
......................\elements3.dat
......................\f.m
......................\fem2d_nonlinear.m
......................\g.m
......................\localdj.m
......................\localj.m
......................\show.m
......................\u_d.m