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。
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。
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.
用紧致性论证给出了任一域k上行列有限的无限方阵a具有各种逆方阵的基本的充分必要条件。
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.
用紧致性论证给出了任一域k上行列有限的无限方阵a具有各种逆方阵的基本的充分必要条件。
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