#include <cmath>
#include <matplot/matplot.h>
int main() {
using namespace matplot;
vector_1d t = iota(1. / 16, 1. / 8, 1);
t = transform(t, [](double t) { return t * 2. * pi; });
vector_1d x = transform(t, [](double t) { return cos(t); });
vector_1d y = transform(t, [](double t) { return sin(t); });
std::string color = "r";
matplot::fill(x, y, color);
axis(equal);
show();
return 0;
}