The modal matrix, ([mathrm{X}]), is given by a. ([X]=left[begin{array}{llll}vec{X}^{(1)} & vec{X}^{(2)} & cdots & vec{X}^{(n)}end{array} ight]) b.

The modal matrix, \([\mathrm{X}]\), is given by

a. \([X]=\left[\begin{array}{llll}\vec{X}^{(1)} & \vec{X}^{(2)} & \cdots & \vec{X}^{(n)}\end{array}\right]\)

b. \([X]=\left[\begin{array}{c}\vec{X}^{(1)^{T}} \\ \vec{X}^{(2)^{T}} \\ \vdots \\ \vec{X}^{(n)^{T}}\end{array}\right]\)

c. \([X]=[k]^{-1}[m]\)