Converts a numerical description of harmonic coefficients to a named list.
Source:R/core-utils.R
coeff_split.Rdcoeff_split returns a named list of coordinates from a vector of
harmonic coefficients. For instance, harmonic coefficients are arranged in
the $coe slot of Coe-objects in that way: A1,…,An,B1,…,Bn,C1,…,Cn,D1,…,D−n after an elliptical
Fourier analysis (see efourier and efourier) while CnandDn harmonic are absent for radii variation and tangent angle
approaches (see rfourier and tfourier respectively). This
function is used internally but might be of interest elwewhere.
Arguments
- cs
A
vectorof harmonic coefficients.- nb.h
numeric. The maximum harmonic rank.- cph
numeric. Must be set to 2 forrfourierandtfourierwere used.
Examples
coeff_split(1:128, nb.h=32, cph=4) # efourier
#> $an
#> [1] 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
#> [26] 26 27 28 29 30 31 32
#>
#> $bn
#> [1] 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57
#> [26] 58 59 60 61 62 63 64
#>
#> $cn
#> [1] 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89
#> [26] 90 91 92 93 94 95 96
#>
#> $dn
#> [1] 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115
#> [20] 116 117 118 119 120 121 122 123 124 125 126 127 128
#>
coeff_split(1:64, nb.h=32, cph=2) # t/r fourier
#> $an
#> [1] 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
#> [26] 26 27 28 29 30 31 32
#>
#> $bn
#> [1] 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57
#> [26] 58 59 60 61 62 63 64
#>