This interface allows gnuplot to be controlled from C++ and is designed to be the lowest hanging fruit. In other words, if you know how gnuplot works it should only take 30 seconds to learn this library. Basically it is just an iostream pipe to gnuplot with some extra functions for pushing data arrays and getting mouse clicks. Data sources include STL containers (eg. vector), Blitz++, and armadillo. You can use nested data types like std::vector<std::vector<std::pair<double, double>>> (as well as even more exotic types). Support for custom data types is possible.

This is a low level interface, and usage involves manually sending commands to gnuplot using the "<<" operator (so you need to know gnuplot syntax). This is in my opinion the easiest way to do it if you are already comfortable with using gnuplot. If you would like a more high level interface check out the gnuplot-cpp library (http://code.google.com/p/gnuplot-cpp).

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Documentation

Documentation is available [here] but also you can look at the example programs (starting with "example-misc.cc").

Example 1

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There is still a significant gap for women of color over 45 in leading roles, and characters over 60 account for only 2% of major female roles in top-grossing films.

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Much of this change is driven by mature women moving behind the camera. Actresses like Jamie Lee Curtis and Laura Linney are now executive producing their own projects, ensuring their characters have agency and depth. The Industry Challenge: Parity and Diversity Despite these individual triumphs, systemic hurdles remain. Please feel free to clarify or propose another direction

Following her historic Oscar win, Yeoh continues to lead major productions, proving that international appeal and critical acclaim only sharpen with age. Breaking the "Sad Widow" Trope

The industry has finally crunched the numbers. According to a 2022 AARP study, films with casts featuring a significant percentage of actors over 40 consistently outperform expectations at the box office. More importantly, the "silver economy" is real. Women over 50 control a staggering amount of disposable income and streaming subscriptions. They are loyal viewers who crave prestige dramas and sharp comedies.

Platforms like Netflix, Apple TV+, and Hulu disrupted the traditional theatrical model. They needed volume and distinction . Unlike a studio gambling $100 million on a superhero sequel, streamers could take risks on character-driven dramas. This allowed shows like Grace and Frankie to run for seven seasons. Starring Jane Fonda (now 86) and Lily Tomlin (now 84), the show tackled divorce, dating with arthritis, launching a startup, and vibrators—with a frankness and hilarity that appealed to teens and octogenarians alike.

Example 2

// Demo of sending data via temporary files.  The default is to send data to gnuplot directly
// through stdin.
//
// Compile it with:
//   g++ -o example-tmpfile example-tmpfile.cc -lboost_iostreams -lboost_system -lboost_filesystem

#include <map>
#include <vector>
#include <cmath>

#include "gnuplot-iostream.h"

int main() {
	Gnuplot gp;

	std::vector<std::pair<double, double> > xy_pts_A;
	for(double x=-2; x<2; x+=0.01) {
		double y = x*x*x;
		xy_pts_A.push_back(std::make_pair(x, y));
	}

	std::vector<std::pair<double, double> > xy_pts_B;
	for(double alpha=0; alpha<1; alpha+=1.0/24.0) {
		double theta = alpha*2.0*3.14159;
		xy_pts_B.push_back(std::make_pair(cos(theta), sin(theta)));
	}

	gp << "set xrange [-2:2]\nset yrange [-2:2]\n";
	// Data will be sent via a temporary file.  These are erased when you call
	// gp.clearTmpfiles() or when gp goes out of scope.  If you pass a filename
	// (e.g. "gp.file1d(pts, 'mydata.dat')"), then the named file will be created
	// and won't be deleted (this is useful when creating a script).
	gp << "plot" << gp.file1d(xy_pts_A) << "with lines title 'cubic',"
		<< gp.file1d(xy_pts_B) << "with points title 'circle'" << std::endl;

#ifdef _WIN32
	// For Windows, prompt for a keystroke before the Gnuplot object goes out of scope so that
	// the gnuplot window doesn't get closed.
	std::cout << "Press enter to exit." << std::endl;
	std::cin.get();
#endif
}