Function copper

source/matplot/util/colors.cpp:2546–2624

            return result;
        }
        std::vector<std::vector<double>> copper(size_t n) {
            static std::vector<std::vector<double>> map = {
                {0, 0, 0},
                {0.0198413, 0.0124, 0.00789683},
                {0.0396825, 0.0248, 0.0157937},
                {0.0595238, 0.0372, 0.0236905},
                {0.0793651, 0.0496, 0.0315873},
                {0.0992063, 0.062, 0.0394841},
                {0.119048, 0.0744, 0.047381},
                {0.138889, 0.0868, 0.0552778},
                {0.15873, 0.0992, 0.0631746},
                {0.178571, 0.1116, 0.0710714},
                {0.198413, 0.124, 0.0789683},
                {0.218254, 0.1364, 0.0868651},
                {0.238095, 0.1488, 0.0947619},
                {0.257937, 0.1612, 0.102659},
                {0.277778, 0.1736, 0.110556},
                {0.297619, 0.186, 0.118452},
                {0.31746, 0.1984, 0.126349},
                {0.337302, 0.2108, 0.134246},
                {0.357143, 0.2232, 0.142143},
                {0.376984, 0.2356, 0.15004},
                {0.396825, 0.248, 0.157937},
                {0.416667, 0.2604, 0.165833},
                {0.436508, 0.2728, 0.17373},
                {0.456349, 0.2852, 0.181627},
                {0.47619, 0.2976, 0.189524},
                {0.496032, 0.31, 0.197421},
                {0.515873, 0.3224, 0.205317},
                {0.535714, 0.3348, 0.213214},
                {0.555556, 0.3472, 0.221111},
                {0.575397, 0.3596, 0.229008},
                {0.595238, 0.372, 0.236905},
                {0.615079, 0.3844, 0.244802},
                {0.634921, 0.3968, 0.252698},
                {0.654762, 0.4092, 0.260595},
                {0.674603, 0.4216, 0.268492},
                {0.694444, 0.434, 0.276389},
                {0.714286, 0.4464, 0.284286},
                {0.734127, 0.4588, 0.292183},
                {0.753968, 0.4712, 0.300079},
                {0.77381, 0.4836, 0.307976},
                {0.793651, 0.496, 0.315873},
                {0.813492, 0.5084, 0.32377},
                {0.833333, 0.5208, 0.331667},
                {0.853175, 0.5332, 0.339563},
                {0.873016, 0.5456, 0.34746},
                {0.892857, 0.558, 0.355357},
                {0.912698, 0.5704, 0.363254},
                {0.93254, 0.5828, 0.371151},
                {0.952381, 0.5952, 0.379048},
                {0.972222, 0.6076, 0.386944},
                {0.992063, 0.62, 0.394841},
                {1, 0.6324, 0.402738},
                {1, 0.6448, 0.410635},
                {1, 0.6572, 0.418532},
                {1, 0.6696, 0.426429},
                {1, 0.682, 0.434325},