matplotlib-cpp/examples/basic.cpp at master · lava/matplotlib-cpp · GitHub

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#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);

}

// Set the size of output image = 1200x780 pixels

plt::figure_size(1200, 780);

// 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);

}

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