code
代码说明：
有限元求解结构固有频率和振型、显示（中心差分法，Newmark法）、隐式法、非线性法程序(middle difference/Newmark/nonlinear)
文件列表：
code
....\add
....\...\input.txt,77,2013-12-16
....\...\main.m,6420,2013-12-16
....\...\output.txt,56,2013-12-16
....\middle
....\......\0.000002,37292,2013-12-12
....\......\assem.m,132,2013-12-08
....\......\beam2d.m,312,2013-12-08
....\......\caldof.m,237,2013-12-08
....\......\MAIN.m,1243,2013-12-12
....\......\step2.m,553,2013-12-12
....\......\truthadd.m,214,2013-12-12
....\newmark
....\.......\assem.m,132,2013-12-08
....\.......\beam2d.m,312,2013-12-08
....\.......\caldof.m,237,2013-12-08
....\.......\MAIN.m,1719,2013-12-12
....\.......\step2.m,795,2013-12-12
....\.......\truth.m,666,2013-12-12
....\.......\truthadd.m,214,2013-12-12
....\plus
....\....\beam2crd.m,486,2013-12-11
....\....\eigen.m,827,2013-12-10
....\....\eldisp2.m,510,2013-12-11
....\....\eldraw2.m,427,2013-12-11
....\....\extract.m,115,2013-12-10
....\....\input.txt,120,2013-12-08
....\....\MAIN.m,4191,2013-12-12
....\....\pltstyle.m,517,2013-12-08
....\....\truthadd.m,214,2013-12-12
....\solve_freq
....\..........\truth.m,302,2013-12-12
....\..........\truthadd.m,214,2013-12-12
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