From 19b280e089b5218a68c8a271326c2f37f854071f Mon Sep 17 00:00:00 2001
From: Carles Fernandez <carles.fernandez@gmail.com>
Date: Sun, 22 Oct 2017 08:20:51 +0200
Subject: [PATCH] Add persist to gnuplot terminal

---
 src/tests/common-files/gnuplot_i.h            |  6 ++---
 .../unit-tests/arithmetic/fft_length_test.cc  | 25 +++----------------
 2 files changed, 5 insertions(+), 26 deletions(-)

diff --git a/src/tests/common-files/gnuplot_i.h b/src/tests/common-files/gnuplot_i.h
index 9427bcaac..183e51101 100644
--- a/src/tests/common-files/gnuplot_i.h
+++ b/src/tests/common-files/gnuplot_i.h
@@ -1050,7 +1050,7 @@ Gnuplot& Gnuplot::set_smooth(const std::string &stylestr)
 Gnuplot& Gnuplot::showonscreen()
 {
     cmd("set output");
-    cmd("set terminal " + Gnuplot::terminal_std);
+    cmd("set terminal " + Gnuplot::terminal_std + " persist");
 
     return *this;
 }
@@ -1062,10 +1062,8 @@ Gnuplot& Gnuplot::showonscreen()
 //
 Gnuplot& Gnuplot::savetops(const std::string &filename)
 {
-    cmd("set terminal postscript color");
-
     std::ostringstream cmdstr;
-    cmdstr << "set term postscript\n";
+    cmdstr << "set term postscript landscape enhanced color dashed \"Times-Roman\" 18\n";
     cmdstr << "set output \"" << filename << ".ps\"\n";
     cmdstr << "replot";
     cmd(cmdstr.str());
diff --git a/src/tests/unit-tests/arithmetic/fft_length_test.cc b/src/tests/unit-tests/arithmetic/fft_length_test.cc
index 1b7a98427..e04455c04 100644
--- a/src/tests/unit-tests/arithmetic/fft_length_test.cc
+++ b/src/tests/unit-tests/arithmetic/fft_length_test.cc
@@ -46,26 +46,10 @@
 
 
 DEFINE_int32(fft_iterations_test, 1000, "Number of averaged iterations in FFT length timing test");
-DEFINE_bool(plot_fft_length_test, false, "Plots results of FFTLengthTest");
-
-
-class FFTLengthTest: public ::testing::Test
-{
-public:
-    void wait_for_key();
-};
-
-
-void FFTLengthTest::wait_for_key()
-{
-    std::cout << std::endl << "Press ENTER to continue..." << std::endl;
-
-    std::cin.clear();
-    std::cin.ignore(std::cin.rdbuf()->in_avail());
-    std::cin.get();
-    return;
-}
+DEFINE_bool(plot_fft_length_test, false, "Plots results of FFTLengthTest with gnuplot");
 
+// Note from FFTW documentation: the standard FFTW distribution works most efficiently for arrays whose
+// size can be factored into small primes (2, 3, 5, and 7), and otherwise it uses a slower general-purpose routine.
 
 TEST_F(FFTLengthTest, MeasureExecutionTime)
 {
@@ -160,9 +144,6 @@ TEST_F(FFTLengthTest, MeasureExecutionTime)
                             g2.set_style("points").plot_xy(powers_of_two, execution_times_powers_of_two, "Power of 2");
                             g2.savetops("FFT_execution_times");
                             g2.showonscreen(); // window output
-#if !defined __APPLE__
-                            wait_for_key();
-#endif
                     }
                     catch (GnuplotException ge)
                     {