wecopttool.core.WEC.derivative2_mat
- property WEC.derivative2_mat: ndarray
Matrix to create Fourier coefficients of the second derivative of some quantity.
For some array of Fourier coefficients
x
(excluding the sine component of the highest frequency), size(2*nfreq, ndof)
, the Fourier coefficients of the second derivative ofx
are obtained viaderivative2_mat @ x
.