Closed diehlpk closed 4 years ago
With these changes the higher accuracy works
ython 3.8.3 (default, May 15 2020, 00:00:00) [GCC 10.1.1 20200507 (Red Hat 10.1.1-1)] on linux Type "help", "copyright", "credits" or "license" for more information. >>> import findiff >>> coefs = findiff.coefficients(deriv=1, acc=15) >>> coefs {'center': {'coefficients': array([ 9.71250971e-06, -1.77600178e-04, 1.55400155e-03, -8.70240870e-03, 3.53535353e-02, -1.13131313e-01, 3.11111111e-01, -8.88888889e-01, -3.35961124e-10, 8.88888889e-01, -3.11111111e-01, 1.13131313e-01, -3.53535354e-02, 8.70240870e-03, -1.55400155e-03, 1.77600178e-04, -9.71250971e-06]), 'offsets': array([-8, -7, -6, -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8])}, 'forward': {'coefficients': array([-3.13521989e+00, 1.23812179e+01, -3.58205673e+01, 8.69500474e+01, -1.67677472e+02, 2.57681506e+02, -3.17608486e+02, 3.15015193e+02, -2.51170987e+02, 1.60051983e+02, -8.05591687e+01, 3.14080358e+01, -9.19335226e+00, 1.91993904e+00, -2.61530883e-01, 1.93028986e-02, -4.40848608e-04]), 'offsets': array([ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16])}, 'backward': {'coefficients': array([ 6.25000664e-02, -1.06666777e+00, 8.57143716e+00, -4.30769648e+01, 1.51666808e+02, -3.97091263e+02, 8.00800679e+02, -1.27111213e+03, 1.60875120e+03, -1.63428683e+03, 1.33466749e+03, -8.73600475e+02, 4.55000209e+02, -1.86666735e+02, 6.00000154e+01, -1.60000022e+01, 3.38072914e+00]), 'offsets': array([-16, -15, -14, -13, -12, -11, -10, -9, -8, -7, -6, -5, -4, -3, -2, -1, 0])}} >>> coefs["center"] {'coefficients': array([ 9.71250971e-06, -1.77600178e-04, 1.55400155e-03, -8.70240870e-03, 3.53535353e-02, -1.13131313e-01, 3.11111111e-01, -8.88888889e-01, -3.35961124e-10, 8.88888889e-01, -3.11111111e-01, 1.13131313e-01, -3.53535354e-02, 8.70240870e-03, -1.55400155e-03, 1.77600178e-04, -9.71250971e-06]), 'offsets': array([-8, -7, -6, -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8])} >>> coefs = findiff.coefficients(deriv=1, acc=16) >>> coefs["center"] {'coefficients': array([ 9.71250971e-06, -1.77600178e-04, 1.55400155e-03, -8.70240870e-03, 3.53535353e-02, -1.13131313e-01, 3.11111111e-01, -8.88888889e-01, -3.35961124e-10, 8.88888889e-01, -3.11111111e-01, 1.13131313e-01, -3.53535354e-02, 8.70240870e-03, -1.55400155e-03, 1.77600178e-04, -9.71250971e-06]), 'offsets': array([-8, -7, -6, -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8])}
Thanks for the fix! :-)
With these changes the higher accuracy works