Numpy was not working properly, but after putting

pip uninstall numpy
pip install "numpy<2"

it was resolved. You can add this to README

But i got this error after running
./surface
terminate called after throwing an instance of 'std::runtime_error'
what(): No axis
Aborted (core dumped)

Other examples worked except for:
./nonblock
terminate called after throwing an instance of 'std::runtime_error'
what(): Call to subplot() failed.
Aborted (core dumped)

./lines3d
terminate called after throwing an instance of 'std::runtime_error'
what(): No axis
Aborted (core dumped)

3d functionality does not work and with WITHOUT_NUMPY defined it does not even compile

In function ‘int main()’:
surface.cpp:22:10: error: ‘plot_surface’ is not a member of ‘plt’
22 | plt::plot_surface(x, y, z);
| ^~~~~~~~~~~~