third_party/matplotlib-cpp/examples/basic.cpp

#define _USE_MATH_DEFINES
#include <iostream>
#include <cmath>
#include "../matplotlibcpp.h"

namespace plt = matplotlibcpp;

int main() 
{
	// Prepare data.
	int n = 5000;
	std::vector<double> x(n), y(n), z(n), w(n,2);
	for(int i=0; i<n; ++i) {
		x.at(i) = i*i;
		y.at(i) = sin(2*M_PI*i/360.0);
		z.at(i) = log(i);
	}

	// Plot line from given x and y data. Color is selected automatically.
	plt::plot(x, y);
	// Plot a red dashed line from given x and y data.
	plt::plot(x, w,"r--");
	// Plot a line whose name will show up as "log(x)" in the legend.
	plt::named_plot("log(x)", x, z);

	// Set x-axis to interval [0,1000000]
	plt::xlim(0, 1000*1000);

	// Add graph title
	plt::title("Sample figure");
	// Enable legend.
	plt::legend();
	// save figure
	const char* filename = "./basic.png";
	std::cout << "Saving result to " << filename << std::endl;;
	plt::save(filename);
}