def sin_gen(N, m):
rarr = sin_arr(N,m)
rarr_x = vcalc.cderivative(rarr, 'X_DIR', order=1) * rarr.size
rarr_y = vcalc.cderivative(rarr, 'Y_DIR', order=1) * rarr.size
ok_(np.allclose(rarr_y, np.zeros(rarr_y.shape)))
ok_(np.allclose(rarr_x, m * cos_arr(N, m)))
def cos_gen(N, m):
rarr = np.transpose(cos_arr(N,m))
rarr_x = vcalc.cderivative(rarr, 'X_DIR', order=1) * rarr.size
rarr_y = vcalc.cderivative(rarr, 'Y_DIR', order=1) * rarr.size
ok_(np.allclose(rarr_x, np.zeros(rarr_x.shape)))
ok_(np.allclose(rarr_y, np.transpose(-m * sin_arr(N, m))))
def cderiv_gen(N,m,n):
rarr = sin_cos_arr(N,m,n)
rarr_xx = vcalc.cderivative(rarr, 'X_DIR', order=2)
rarr_yy = vcalc.cderivative(rarr, 'Y_DIR', order=2)
rarr_laplacian = vcalc.laplacian(rarr)
ok_(np.allclose(rarr_laplacian, rarr_xx + rarr_yy))
