cryoris / matplotlib-cpp Goto Github PK

If you use the latest version of Python 3.11, the library calls functions considered obsolete since that version. It is possible to force the compiler to ignore the warning, but this means that these functions may cease to exist at some point.

Hello,

First, thanks for the great code. It is very helpful to have something nice to visualize the c++ results.

I have go through the code and it seems I am compiling it correctly. However, I am having the following error after the compilation:

"Undefined symbols for architecture arm64:
"_engClose", referenced from:
_main in MatlabPlot-8d1732.o
"_engEvalString", referenced from:
_main in MatlabPlot-8d1732.o
"_engGetVariable", referenced from:
_main in MatlabPlot-8d1732.o
"_engOpen", referenced from:
_main in MatlabPlot-8d1732.o
"_engOutputBuffer", referenced from:
_main in MatlabPlot-8d1732.o
"_engPutVariable", referenced from:
_main in MatlabPlot-8d1732.o
"_mxCreateDoubleMatrix_800", referenced from:
_main in MatlabPlot-8d1732.o
"_mxDestroyArray_800", referenced from:
_main in MatlabPlot-8d1732.o
"_mxGetClassName_800", referenced from:
_main in MatlabPlot-8d1732.o
"_mxGetPr_800", referenced from:
_main in MatlabPlot-8d1732.o
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)"

I wonder if there is a solution for this. I am running in an M1 MacBook Pro.

Thanks in advance.

If I declare an

Eigen::Matrix _2D_data; /* The initialization does not matter. The first row holds the x-coordinates, and the second row holds the y-
coordinates. */

and I want to call

plt::plot(_2D_data.row(1), _2D_data.row(2));

the resulting plot will not be correct. Around 50% of the points will have their coordinates reversed (the x-coordinates will become y-coordinates and vice-versa).

To correctly plot, I have to write:

Eigen::VectorX x_coords{ _2D_data.row(0) };
Eigen::VectorX y_coords{ _2D_data.row(1) };

plt::plot(x_coords, y_coords);

Thanks for the otherwise great library!

Calling plt::save(file) or plt::savefig(file) returns this error:

terminate called after throwing an instance of 'std::runtime_error'
  what():  Call to save() failed.

When compiling a standard example from readthedocs,

#include
#include "matplotlibcpp.h"
namespace plt = matplotlibcpp;
int main() {
std::vector x = {1, 2, 3, 4};
std::vector y = {1, 4, 9, 16};
plt::plot(x, y,"r*");
plt::show();
}

on VisualStudio22 with the ISO C++20 flag and native Python 3.10, I get

Apparently, the compiler cannot decide between

// @brief standard plot function supporting the args (x, y, s, keywords) // line 519
// ...
template <typename VectorX, typename VectorY>
bool plot(const VectorX &x, const VectorY &y, const std::string &s = "",
const std::map<std::string, std::string> &keywords = {}) {
return detail::plot_base(detail::_interpreter::get().s_python_function_plot,
x, y, s, keywords);
}

and

// enable plotting of multiple triples (x, y, format) // line 1953
template <typename A, typename B, typename... Args>
bool plot(const A &a, const B &b, const std::string &format, Args... args) {
return plot(a, b, format) && plot(args...);
}

As I understand, correct me if I'm wrong, there a several constructors, each of which is designed to fall through to the first one above, the one that finally calls plot_base. So, I renamed all constructors but the first one above plot1, and my code now successfully calls plt::plot1 ..... Of course, messing with your library and using non-standard calls on my side is not a proper solution. Rename the fall-through constructor, and I haven't even tested similarily overloaded functions?

my environment:
visual studio2022 use qt to draw image by matplotlibcpp, and i can draw all images in your https://github.com/Cryoris/matplotlib-cpp/readme.md except this one:

#include "../matplotlibcpp.h"

namespace plt = matplotlibcpp;

int main()
{
    std::vector<std::vector<double>> x, y, z;
    for (double i = -5; i <= 5;  i += 0.25) {
        std::vector<double> x_row, y_row, z_row;
        for (double j = -5; j <= 5; j += 0.25) {
            x_row.push_back(i);
            y_row.push_back(j);
            z_row.push_back(::std::sin(::std::hypot(i, j)));
        }
        x.push_back(x_row);
        y.push_back(y_row);
        z.push_back(z_row);
    }

    plt::plot_surface(x, y, z);
    plt::show();
}

the error is said there is a not processed error.
please answer me , thakns