import std.range : walkLength;
auto aes = Aes!(double[], "x", string[], "colour", double[], "alpha")
([0,1,2,3], ["a","a","b","b"], [0,1,0,1]);
assertEqual(group!("colour","alpha")(aes).walkLength,4);
assertEqual(group!("alpha")(aes).walkLength,2);
assertEqual(group(aes).walkLength,4);auto aes = Aes!(double[], "x", double[], "y", string[], "colour")([1.0,
2.0, 1.1], [3.0, 1.5, 1.1], ["a", "b", "a"]);
import std.range : walkLength, front, popFront;
auto grouped = aes.group;
assertEqual(grouped.walkLength, 2);
assertEqual(grouped.front.walkLength, 2);
grouped.popFront;
assertEqual(grouped.front.walkLength, 1);
Groups data by colour label etc.
Will also add DefaultValues for label etc to the data. It is also possible to specify exactly what to group by on as a template parameter. See example.