Some examples dont work (segfault and std::runtime_error)

[2shaar2059]

I cloned the repo, made a build directory and made all of the examples. When trying to run them, however, certain ones worked and others didnt. The ones that simply segfaulted still displayed a plot. the ones that resulted in a runtime error didnt even show a plot.

System:
OS: Ubuntu 20.04.4 LTS x86_64
Kernel: 5.4.0-113-generic
"python3 --version" gives Python 3.8.10

$ ./animation
Segmentation fault (core dumped)

$ ./basic
Saving result to ./basic.png
Segmentation fault (core dumped)

$ ./contour
Segmentation fault (core dumped)

$ ./fill
Segmentation fault (core dumped)

$ ./bar
Segmentation fault (core dumped)

$ ./colorbar
Segmentation fault (core dumped)

$ ./lines3d
Segmentation fault (core dumped)

$ ./minimal
Segmentation fault (core dumped)

$ ./surface
Segmentation fault (core dumped)

$ ./modern
Segmentation fault (core dumped)

$ ./spy
Segmentation fault (core dumped)

$ ./subplot2grid
Segmentation fault (core dumped)

$ ./update
Segmentation fault (core dumped)

$ ./xkcd
findfont: Font family ['xkcd', 'xkcd Script', 'Humor Sans', 'Comic Neue', 'Comic Sans MS'] not found. Falling back to DejaVu Sans.
findfont: Font family ['xkcd', 'xkcd Script', 'Humor Sans', 'Comic Neue', 'Comic Sans MS'] not found. Falling back to DejaVu Sans.
Segmentation fault (core dumped)

$ ./fill_inbetween
terminate called after throwing an instance of 'std::runtime_error'
what(): Call to show() failed.
Aborted (core dumped)

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

[xiang-tao]

I ran into a similar error to yours, my bug report is:

terminate called after throwing an instance of 'std::runtime_error' ，what(): No axis

The reason for my error is that Ubuntu installed matplotlib in two ways:

sudo pip3 install matplotlib
sudo apt install python3-matplotlib

Therefore, one of them should be uninstalled when performing 3D drawing, so I executed:

sudo pip3 uninstall matplotlib

After that it ran successfully.

[mitrakelly]

I am seeing the same problem and this solution did not work for me. I am running on Windows and I have only one installation of matplotlib. It's version 3.7.1.

[kevinpowell]

Same error for me. Arch linux with python 3.10.10
here's the backtrace from gdb:
(gdb) bt
#0 __pthread_kill_implementation (threadid=, signo=signo@entry=6, no_tid=no_tid@entry=0)
at pthread_kill.c:44
#1 0x00007ffff74a0953 in __pthread_kill_internal (signo=6, threadid=) at pthread_kill.c:78
#2 0x00007ffff7451ea8 in __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26
#3 0x00007ffff743b53d in __GI_abort () at abort.c:79
#4 0x00007ffff769a833 in __gnu_cxx::__verbose_terminate_handler ()
at /usr/src/debug/gcc/gcc/libstdc++-v3/libsupc++/vterminate.cc:95
#5 0x00007ffff76a6d0c in __cxxabiv1::__terminate (handler=)
at /usr/src/debug/gcc/gcc/libstdc++-v3/libsupc++/eh_terminate.cc:48
#6 0x00007ffff76a6d79 in std::terminate () at /usr/src/debug/gcc/gcc/libstdc++-v3/libsupc++/eh_terminate.cc:58
#7 0x00007ffff76a6fdd in __cxxabiv1::__cxa_throw (obj=,
tinfo=0x555555562d60 <typeinfo for std::runtime_error@GLIBCXX_3.4>,
dest=0x7ffff76be480 std::runtime_error::~runtime_error())
at /usr/src/debug/gcc/gcc/libstdc++-v3/libsupc++/eh_throw.cc:98
#8 0x000055555555a369 in matplotlibcpp::plot_surface (x=std::vector of length 41, capacity 64 = {...},
y=std::vector of length 41, capacity 64 = {...}, z=std::vector of length 41, capacity 64 = {...},
keywords=std::map with 0 elements, fig_number=0) at ../matplotlibcpp.h:567
#9 0x00005555555569e7 in main () at surface.cpp:22

[kevinpowell]

And, I've got a fix for this issue.
see https://stackoverflow.com/questions/76077363/why-does-matplotlib-cpp-throw-runtime-exceptions-in-the-3d-examples

[lanzhan777]

Same issue.
It seem because python matplotlib API has changed.
I change matplotlib 3.7.2 to matplotlib 3.6.1 and it works.