8000 Update README and Makefile for quiver plot example. · michLab/matplotlib-cpp@0791945 · GitHub
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Benno Evers
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Update README and Makefile for quiver plot example.
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‎Makefile

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examples: minimal basic modern animation nonblock xkcd
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examples: minimal basic modern animation nonblock xkcd quiver
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minimal: examples/minimal.cpp matplotlibcpp.h
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cd examples && g++ -DWITHOUT_NUMPY minimal.cpp -I/usr/include/python2.7 -lpython2.7 -o minimal -std=c++11
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nonblock: examples/nonblock.cpp matplotlibcpp.h
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cd examples && g++ nonblock.cpp -I/usr/include/python2.7 -lpython2.7 -o nonblock -std=c++11
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quiver: examples/quiver.cpp matplotlibcpp.h
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cd examples && g++ quiver.cpp -I/usr/include/python2.7 -lpython2.7 -o quiver -std=c++11
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xkcd: examples/xkcd.cpp matplotlibcpp.h
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cd examples && g++ xkcd.cpp -I/usr/include/python2.7 -lpython2.7 -o xkcd -std=c++11
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clean:
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rm -f examples/{minimal,basic,modern,animation,nonblock,xkcd}
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rm -f examples/{minimal,basic,modern,animation,nonblock,xkcd,quiver}

‎README.md

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z.at(i) = log(i);
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}
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// Set the size of output image = 1200x780 pixels
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// Set the size of output image to 1200x780 pixels
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plt::figure_size(1200, 780);
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// Plot line from given x and y data. Color is selected automatically.
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plt::plot(x, y);
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// Plot a red dashed line from given x and y data.
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plt::plot(x, w,"r--");
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// Plot a line whose name will show up as "log(x)" in the legend.
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plt::named_plot("log(x)", x, z);
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// Set x-axis to interval [0,1000000]
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plt::xlim(0, 1000*1000);
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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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// Save the image (file format is determined by the extension)
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```
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g++ basic.cpp -I/usr/include/python2.7 -lpython2.7
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Result: ![Basic example](./examples/basic.png)
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**Result:**
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![Basic example](./examples/basic.png)
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matplotlib-cpp doesn't require C++11, but will enable some additional syntactic sugar when available:
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```cpp
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```
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g++ modern.cpp -std=c++11 -I/usr/include/python2.7 -lpython
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Result: ![Modern example](./examples/modern.png)
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**Result:**
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![Modern example](./examples/modern.png)
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Or some *funny-looking xkcd-styled* example:
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```cpp
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**Result:**
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![Minimal example](./examples/xkcd.png)
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![xkcd example](./examples/xkcd.png)
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When working with vector fields, you might be interested in quiver plots:
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```cpp
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#include "../matplotlibcpp.h"
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namespace plt = matplotlibcpp;
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int main()
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{
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// u and v are respectively the x and y components of the arrows we're plotting
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std::vector<int> x, y, u, v;
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for (int i = -5; i <= 5; i++) {
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for (int j = -5; j <= 5; j++) {
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x.push_back(i);
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u.push_back(-i);
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y.push_back(j);
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v.push_back(-j);
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}
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}
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plt::quiver(x, y, u, v);
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plt::show();
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}
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```
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g++ quiver.cpp -std=c++11 -I/usr/include/python2.7 -lpython2.7
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**Result:**
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![quiver example](./examples/quiver.png)
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Installation
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------------

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