8000 more eigen examples · Cryoris/matplotlib-cpp@f872d23 · GitHub
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more eigen examples
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‎Makefile

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@@ -18,7 +18,7 @@ eigen_include = -I /usr/local/include/eigen3
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examples: minimal basic modern animation nonblock xkcd quiver bar surface subplot fill_inbetween fill update
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eigen: eigen_basic eigen_modern
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eigen: eigen_basic eigen_modern eigen_loglog
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minimal: examples/minimal.cpp matplotlibcpp.h
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cd examples && g++ -DWITHOUT_NUMPY minimal.cpp ${includes} ${linkings} -o minimal ${definitions}
@@ -66,5 +66,9 @@ eigen_basic: examples/eigen/basic.cpp matplotlibcpp.h
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eigen_modern: examples/eigen/modern.cpp matplotlibcpp.h
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cd examples/eigen && g++ modern.cpp ${includes} ${eigen_include} ${linkings} -o $@ ${definitions}
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eigen_loglog: examples/eigen/loglog.cpp matplotlibcpp.h
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cd examples/eigen && g++ loglog.cpp ${includes} ${eigen_include} ${linkings} -o $@ ${definitions}
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clean:
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rm -f examples/{minimal,basic,modern,animation,nonblock,xkcd,quiver,bar,surface,subplot,fill_inbetween,fill,update}
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rm -f examples/eigen/{eigen_basic,eigen_modern,eigen_loglog}

‎examples/eigen/loglog.cpp

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#define _USE_MATH_DEFINES
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#include "../../matplotlibcpp.h"
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#include <Eigen/Dense>
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#include <cmath>
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#include <iostream>
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namespace plt = matplotlibcpp;
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int main() {
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// Prepare data.
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int n = 5000;
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Eigen::VectorXd x(n), y(n), z(n), w = Eigen::VectorXd::Ones(n);
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for (int i = 0; i < n; ++i) {
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double value = (1.0 + i) / n;
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x(i) = value;
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y(i) = value * value;
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z(i) = value * value * value;
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}
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// Plot line from given x and y data. Color is selected automatically.
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plt::plot(x, w);
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// Plot a red dashed line from given x and y data.
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plt::plot(x, y, "r--");
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// Plot a line whose name will show up as "log(x)" in the legend.
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plt::plot(x, z, "g:", {{"label", "$x^3$"}});
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// Add graph title
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plt::title("Sample figure");
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// Enable legend.
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plt::legend();
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// show figure
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plt::show();
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}

‎examples/eigen/modern.cpp

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#define _USE_MATH_DEFINES
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#include "../../matplotlibcpp.h"
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#include <Eigen/Dense>
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#include <cmath>
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namespace plt = matplotlibcpp;
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int main() {
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// plot(y) - the x-coordinates are implicitly set to [0,1,...,n)
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// plt::plot({1,2,3,4});
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// Prepare data for parametric plot.
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int n = 5000; // number of data points
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Eigen::VectorXd x(n), y(n), z(n);
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for (int i = 0; i < n; ++i) {
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double t = 2 * M_PI * i / n;
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x(i) = 16 * sin(t) * sin(t) * sin(t);
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y(i) = 13 * cos(t) - 5 * cos(2 * t) - 2 * cos(3 * t) - cos(4 * t);
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z(i) = 12.5 + abs(sin(x(i)));
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}
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// plot() takes an arbitrary number of (x,y,format)-triples.
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// x must be iterable (that is, anything providing begin(x) and end(x)),
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// y must either be callable (providing operator() const) or iterable.
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plt::plot(x, z, "k-", x, y, "r-");
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// show plots
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plt::show();
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}

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