※ 引述《lululen1986 (lululen)》之銘言：
: 假設運動方程式為
: [M]dy^2/dt+[C]dy/dt+[K]y={F}
: [M],[C],[K]為矩陣 {F}為行向量
: t
: 問題就是 [M]矩陣並不是對角矩陣
[M] is symmetric, right?
then [M]=[R]^T[D][R] and [D] is diagonal
and [R][R]^T=1
then [R]^T[D][R]dy^2/dt^2+[C]dy/dt+[K]y=F
[D][R]dy^2/dt^2+[R][C][R]^T[R]dy/dt+[R][K][R]^T[R]y=[R]F
[D]dy'^2/dt^2+[C']dy'/dt+[K']y'=F'
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