The natural frequency of the gas column in simple pipelines was solved using the finite element analysis method. The result agreed with that derived with transportation matrix method.
采用有限元分析方法，对简单管道气柱的固有频率进行求解，其结果与用传递矩阵法求得的结果是一致的。
2
The coefficient matrix is stored by row storage. Column storage address is also provided. Rapid storage of coefficient matrix in finite element method is then realized.
系数阵采用行存储，同时提供按列寻址的地址，实现有限元系数矩阵的快速存储。
3
Some basic necessary and sufficient conditions for the existence of various inverses of a row-column-finite infinite matrix a over a field K are proved by compactness arguments.