--- /dev/null
+
+// (C) Copyright Nick Thompson 2020.
+// (C) Copyright John Maddock 2020.
+// Use, modification and distribution are subject to the
+// Boost Software License, Version 1.0. (See accompanying file
+// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+#include <iostream>
+#include <boost/math/tools/ulps_plot.hpp>
+#include <boost/core/demangle.hpp>
+#include <boost/multiprecision/mpfr.hpp>
+#include <boost/multiprecision/cpp_bin_float.hpp>
+
+using boost::math::tools::ulps_plot;
+
+int main() {
+ using PreciseReal = boost::multiprecision::mpfr_float_100;
+ using CoarseReal = boost::multiprecision::cpp_bin_float_50;
+
+ typedef boost::math::policies::policy<
+ boost::math::policies::promote_float<false>,
+ boost::math::policies::promote_double<false> >
+ no_promote_policy;
+
+ auto ai_coarse = [](CoarseReal const& x)->CoarseReal {
+ return atan(x);
+ };
+ auto ai_precise = [](PreciseReal const& x)->PreciseReal {
+ return atan(x);
+ };
+
+ std::string filename = "cpp_bin_float_atan.svg";
+ int samples = 100000;
+ // How many pixels wide do you want your .svg?
+ int width = 700;
+ // Near a root, we have unbounded relative error. So for functions with roots, we define an ULP clip:
+ PreciseReal clip = 50;
+ // Should we perturb the abscissas?
+ bool perturb_abscissas = false;
+ auto plot = ulps_plot<decltype(ai_precise), PreciseReal, CoarseReal>(ai_precise, CoarseReal(-200), CoarseReal(200), samples, perturb_abscissas);
+ // Note the argument chaining:
+ plot/*.clip(clip)*/.width(width);
+ plot.background_color("white").font_color("black");
+ // Sometimes it's useful to set a title, but in many cases it's more useful to just use a caption.
+ std::string title = "atan ULP plot with cpp_bin_float_50";
+ plot.title(title);
+ plot.vertical_lines(6);
+ plot.add_fn(ai_coarse);
+ // You can write the plot to a stream:
+ //std::cout << plot;
+ // Or to a file:
+ plot.write(filename);
+}