Method legend_string

source/matplot/axes_objects/vectors.cpp:109–114

    }

    std::string vectors::legend_string(std::string_view title) {
        return " keyentry with vectors " +
               line_spec_.plot_string(line_spec::style_to_plot::plot_line_only,
                                      false) +
               " title \"" + escape(title) + "\"";
    }

    std::string vectors::data_string() {
        std::stringstream ss;