Matplotlib - cannot find Numpy header files

Question

I am trying to plot a graph using matplotlib:

#include "matplotlibcpp.h"
namespace plt = matplotlibcpp;

int main() {
    plt::plot({1,2,3,4});
    plt::show();
}

However, when I hit compile I get the following error:

/usr/local/include/matplotlibcpp.h:19:12: 
fatal error: 'numpy/arrayobject.h' file not found

This is how I compile:

g++ main.cpp -std=c++11 -I/usr/include/python2.7 -lpython2.7

Please can someone explain what the problem is and how I can solve it. Thanks in advance.

Answer 1

That error indicates that the numpy headers were not found in one of the default locations like /usr/include .

The solution is to find the include folder of your numpy installation and point the compiler to it with a -I flag.

Your command line should look something like

g++ main.cpp -std=c++11 -I/usr/include/python2.7  -lpython2.7

Answer 2

我通过在mapplotlibcpp.h顶部添加“ #define WITHOUT_NUMPY”标志来解决此问题