Wrapped errorbar function

Author: tustvold

matplotlibcpp.h

@@ -31,6 +31,7 @@ namespace matplotlibcpp {
 			PyObject *s_python_function_ylabel;
 			PyObject *s_python_function_grid;
 			PyObject *s_python_function_clf;
+			PyObject *s_python_function_errorbar;
 			PyObject *s_python_empty_tuple;
 			PyObject *s_python_function_annotate;
 
@@ -79,6 +80,7 @@ namespace matplotlibcpp {
 				s_python_function_save = PyObject_GetAttrString(pylabmod, "savefig");
 				s_python_function_annotate = PyObject_GetAttrString(pymod,"annotate");
 				s_python_function_clf = PyObject_GetAttrString(pymod, "clf");
+				s_python_function_errorbar = PyObject_GetAttrString(pymod, "errorbar");
 
 				if(        !s_python_function_show
 					|| !s_python_function_figure
@@ -95,6 +97,7 @@ namespace matplotlibcpp {
 					|| !s_python_function_save
 					|| !s_python_function_clf
 					|| !s_python_function_annotate
+					|| !s_python_function_errorbar
 				) { throw std::runtime_error("Couldn't find required function!"); }
 
 				if (       !PyFunction_Check(s_python_function_show)
@@ -112,6 +115,7 @@ namespace matplotlibcpp {
 					|| !PyFunction_Check(s_python_function_xlim)
 					|| !PyFunction_Check(s_python_function_save)
 					|| !PyFunction_Check(s_python_function_clf)
+					|| !PyFunction_Check(s_python_function_errorbar)
 				) { throw std::runtime_error("Python object is unexpectedly not a PyFunction."); }
 
 				s_python_empty_tuple = PyTuple_New(0);
@@ -264,6 +268,44 @@ namespace matplotlibcpp {
 		return res;
 	}
 
+	template<typename NumericX, typename NumericY>
+	bool errorbar(const std::vector<NumericX> &x, const std::vector<NumericY> &y, const std::vector<NumericX> &yerr, const std::string &s = "") {
+		assert(x.size() == y.size());
+
+		PyObject *kwargs = PyDict_New();
+		PyObject *xlist = PyList_New(x.size());
+		PyObject *ylist = PyList_New(y.size());
+		PyObject *yerrlist = PyList_New(yerr.size());
+
+		for (size_t i = 0; i < yerr.size(); ++i)
+			PyList_SetItem(yerrlist, i, PyFloat_FromDouble(yerr.at(i)));
+
+		PyDict_SetItemString(kwargs, "yerr", yerrlist);
+
+		PyObject *pystring = PyString_FromString(s.c_str());
+
+		for (size_t i = 0; i < x.size(); ++i) {
+			PyList_SetItem(xlist, i, PyFloat_FromDouble(x.at(i)));
+			PyList_SetItem(ylist, i, PyFloat_FromDouble(y.at(i)));
+		}
+
+		PyObject *plot_args = PyTuple_New(2);
+		PyTuple_SetItem(plot_args, 0, xlist);
+		PyTuple_SetItem(plot_args, 1, ylist);
+
+		PyObject *res = PyObject_Call(detail::_interpreter::get().s_python_function_errorbar, plot_args, kwargs);
+
+		Py_DECREF(kwargs);
+		Py_DECREF(plot_args);
+
+		if (res)
+			Py_DECREF(res);
+		else
+			throw std::runtime_error("Call to errorbar() failed.");
+
+		return res;
+	}
+
 	template<typename Numeric>
 	bool named_plot(const std::string& name, const std::vector<Numeric>& y, const std::string& format = "") {
 		PyObject* kwargs = PyDict_New();