Simple single-file example won't compile #231

ianyepan · 2022-02-18T22:57:10Z

ianyepan
Feb 18, 2022

I am using Arch Linux and have installed the package using "yay -S matplotplusplus". I used a simple example from the docs, as follows:

#include <matplot/matplot.h>

int main() {
  using namespace matplot;
  std::vector<double> t = iota(0, pi / 50, 10 * pi);
  std::vector<double> st = transform(t, [](auto x) { return sin(x); });
  std::vector<double> ct = transform(t, [](auto x) { return cos(x); });
  auto l = plot3(st, ct, t);
  show();
}

(The package seems to be installed just fine, the "clangd language server" is recognizing everything, and pressing "go-to definition" in my editor on transform, plot3, or show all took me to the correct definition, etc.)

However, when I try to compile the file with g++ plot.cpp, I get the following error:

/usr/sbin/ld: /tmp/ccjiTRFK.o: in function `main':
plot2.cpp:(.text+0xa1): undefined reference to `matplot::iota(double, double, double)'
/usr/sbin/ld: plot2.cpp:(.text+0xca): undefined reference to `matplot::transform(std::vector<double, std::allocator<double> > const&, std::function<double (double)>)'
/usr/sbin/ld: plot2.cpp:(.text+0xfc): undefined reference to `matplot::transform(std::vector<double, std::allocator<double> > const&, std::function<double (double)>)'
/usr/sbin/ld: /tmp/ccjiTRFK.o: in function `matplot::show()':
plot2.cpp:(.text._ZN7matplot4showEv[_ZN7matplot4showEv]+0x20): undefined reference to `matplot::gcf()'
/usr/sbin/ld: plot2.cpp:(.text._ZN7matplot4showEv[_ZN7matplot4showEv]+0x34): undefined reference to `matplot::figure_type::show()'
/usr/sbin/ld: /tmp/ccjiTRFK.o: in function `auto matplot::plot3<std::vector<double, std::allocator<double> >, std::vector<double, std::allocator<double> >&, std::vector<double, std::allocator<double> >&>(std::vector<double, std::allocator<double> >, std::vector<double, std::allocator<double> >&, std::vector<double, std::allocator<double> >&)':
plot2.cpp:(.text._ZN7matplot5plot3ISt6vectorIdSaIdEEJRS3_S4_EEEDaT_DpOT0_[_ZN7matplot5plot3ISt6vectorIdSaIdEEJRS3_S4_EEEDaT_DpOT0_]+0x32): undefined reference to `matplot::gca()'
/usr/sbin/ld: plot2.cpp:(.text._ZN7matplot5plot3ISt6vectorIdSaIdEEJRS3_S4_EEEDaT_DpOT0_[_ZN7matplot5plot3ISt6vectorIdSaIdEEJRS3_S4_EEEDaT_DpOT0_]+0x91): undefined reference to `matplot::axes_type::plot3(std::vector<double, std::allocator<double> > const&, std::vector<double, std::allocator<double> > const&, std::vector<double, std::allocator<double> > const&, std::basic_string_view<char, std::char_traits<char> >)'
collect2: error: ld returned 1 exit status

I must say that this error message is quite cryptic to me, and pasting the error message on the internet doesn't seem to lead me anywhere. What am I missing here?
Thanks.