デフォルトのカラーセットを使ってもよいのだが、適当な色を持ってきたい。
Rには色見本がある。
mikuhatsune.hatenadiary.com
このなかで、暗色系の色を適当にもってきてプロットに使いたい、と思ったらほげほげ4 というのがだいたい暗色系統なので、正規表現を使って末尾が4の色を取得すればよい。
stringr::str_subset(colors(), "4$")
[1] "antiquewhite4" "aquamarine4" "azure4" "bisque4" "blue4" [6] "brown4" "burlywood4" "cadetblue4" "chartreuse4" "chocolate4" [11] "coral4" "cornsilk4" "cyan4" "darkgoldenrod4" "darkolivegreen4" [16] "darkorange4" "darkorchid4" "darkseagreen4" "darkslategray4" "deeppink4" [21] "deepskyblue4" "dodgerblue4" "firebrick4" "gold4" "goldenrod4" [26] "gray4" "gray14" "gray24" "gray34" "gray44" [31] "gray54" "gray64" "gray74" "gray84" "gray94" [36] "green4" "grey4" "grey14" "grey24" "grey34" [41] "grey44" "grey54" "grey64" "grey74" "grey84" [46] "grey94" "honeydew4" "hotpink4" "indianred4" "ivory4" [51] "khaki4" "lavenderblush4" "lemonchiffon4" "lightblue4" "lightcyan4" [56] "lightgoldenrod4" "lightpink4" "lightsalmon4" "lightskyblue4" "lightsteelblue4" [61] "lightyellow4" "magenta4" "maroon4" "mediumorchid4" "mediumpurple4" [66] "mistyrose4" "navajowhite4" "olivedrab4" "orange4" "orangered4" [71] "orchid4" "palegreen4" "paleturquoise4" "palevioletred4" "peachpuff4" [76] "pink4" "plum4" "purple4" "red4" "rosybrown4" [81] "royalblue4" "salmon4" "seagreen4" "seashell4" "sienna4" [86] "skyblue4" "slateblue4" "slategray4" "snow4" "springgreen4" [91] "steelblue4" "tan4" "thistle4" "tomato4" "turquoise4" [96] "violetred4" "wheat4" "yellow4"
あとはsample関数などでも使えば適当なカラーセットができる。
