def H1_cheb(f):
f = sp.mirror1(f, -1)
N = f.shape[0]; h = 2*pi/N
f = sp.F(f)
f = sp.fourier_K_inv(f, 0, h)
f = sp.fourier_S(f, +h/2)
f = sp.Finv(f)
f = sp.unmirror1(f)
return real(f)
def H1_cheb(f):
f = sp.mirror1(f, -1)
N = f.shape[0]
h = 2 * pi / N
f = sp.F(f)
f = sp.fourier_K_inv(f, 0, h)
f = sp.fourier_S(f, +h / 2)
f = sp.Finv(f)
f = sp.unmirror1(f)
return real(f)
def H0d_regular(f):
r'''
.. math::
\widetilde{\mathbf{H}}^{0}=
\mathbf{M}_{1}^{\dagger}
\mathbf{I}^{-\frac{h}{2},\frac{h}{2}}
\mathbf{M}_{1}^{+}
'''
f = sp.mirror1(f, +1)
N = f.shape[0]; h = 2*pi/N
f = sp.I_space(-h/2, h/2)(f)
f = sp.unmirror1(f)
return f
def H1_regular(f):
r'''
.. math::
\mathbf{H}^{1}=
\mathbf{M}_{1}^{\dagger}
{\mathbf{I}^{-\frac{h}{2},\frac{h}{2}}}^{-1}
\mathbf{M}_{1}^{+}
'''
f = sp.mirror1(f, +1)
N = f.shape[0]; h = 2*pi/N
f = sp.I_space_inv(-h/2, h/2)(f)
f = sp.unmirror1(f)
return f
def H0d_regular(f):
r'''
.. math::
\widetilde{\mathbf{H}}^{0}=
\mathbf{M}_{1}^{\dagger}
\mathbf{I}^{-\frac{h}{2},\frac{h}{2}}
\mathbf{M}_{1}^{+}
'''
f = sp.mirror1(f, +1)
N = f.shape[0]
h = 2 * pi / N
f = sp.I_space(-h / 2, h / 2)(f)
f = sp.unmirror1(f)
return f
def H1_regular(f):
r'''
.. math::
\mathbf{H}^{1}=
\mathbf{M}_{1}^{\dagger}
{\mathbf{I}^{-\frac{h}{2},\frac{h}{2}}}^{-1}
\mathbf{M}_{1}^{+}
'''
f = sp.mirror1(f, +1)
N = f.shape[0]
h = 2 * pi / N
f = sp.I_space_inv(-h / 2, h / 2)(f)
f = sp.unmirror1(f)
return f
def S_cheb(f):
'''
Interpolate from primal to dual vertices.
>>> S_cheb(array([-1, 0, 1]))
array([-0.70710678, 0.70710678])
>>> S_cheb(array([1, 0, -1]))
array([ 0.70710678, -0.70710678])
>>> sp.to_matrix(S_cheb, 3).round(3)
array([[ 0.604, 0.5 , -0.104],
[-0.104, 0.5 , 0.604]])
'''
f = sp.mirror0(f, +1)
N = f.shape[0]; h = 2*pi/N
f = sp.Finv(sp.F(f)*sp.S_diag(N, h/2))
f = sp.unmirror1(f)
return real(f)
def S_cheb(f):
'''
Interpolate from primal to dual vertices.
>>> S_cheb(array([-1, 0, 1]))
array([-0.70710678, 0.70710678])
>>> S_cheb(array([1, 0, -1]))
array([ 0.70710678, -0.70710678])
>>> sp.to_matrix(S_cheb, 3).round(3)
array([[ 0.604, 0.5 , -0.104],
[-0.104, 0.5 , 0.604]])
'''
f = sp.mirror0(f, +1)
N = f.shape[0]
h = 2 * pi / N
f = sp.Finv(sp.F(f) * sp.S_diag(N, h / 2))
f = sp.unmirror1(f)
return real(f)
