GNU Octave, version 3.5.0+
Copyright (C) 2011 John W. Eaton and others.
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octave:1> graphics_toolkit fltk
doctave:2> demo ("scatter", 3)
scatter example 3:
 rand_10x1_data1 = [0.171577, 0.404796, 0.025469, 0.335309, 0.047814, 0.898480, 0.639599, 0.700247, 0.497798, 0.737940];
 rand_10x1_data2 = [0.75495, 0.83991, 0.80850, 0.73603, 0.19360, 0.72573, 0.69371, 0.74388, 0.13837, 0.54143];
 x = rand_10x1_data1;
 y = rand_10x1_data2;
 s = 10 - 10*log (x.^2 + y.^2);
 h = scatter (x, y, s, s, "s", "filled");

octave:3> quit
==330== Invalid read of size 4
==330==    at 0x5E5D5FC: Fl_Group::clear() (in /usr/lib/libfltk.so.1.1)
==330==    by 0x5E5D87C: Fl_Group::~Fl_Group() (in /usr/lib/libfltk.so.1.1)
==330==    by 0x5E46654: Fl_Window::~Fl_Window() (in /usr/lib/libfltk.so.1.1)
==330==    by 0x7F7C60F: plot_window::~plot_window() (__init_fltk__.cc:757)
==330==    by 0x7F811E9: fltk_graphics_toolkit::finalize(graphics_object const&) (__init_fltk__.cc:1572)
==330==    by 0x4335EE6: gh_manager::do_free(graphics_handle const&) (graphics.h:1945)
==330==    by 0x4336A91: F__go_delete__(octave_value_list const&, int) (graphics.h:10193)
==330==    by 0x45B8F28: octave_builtin::do_multi_index_op(int, octave_value_list const&, std::list<octave_lvalue, std::allocator<octave_lvalue> > const*) (ov-builtin.cc:128)
==330==    by 0x45B7EDE: octave_builtin::subsref(std::string const&, std::list<octave_value_list, std::allocator<octave_value_list> > const&, int, std::list<octave_lvalue, std::allocator<octave_lvalue> > const*) (ov-builtin.cc:63)
==330==    by 0x45B8CE5: octave_builtin::subsref(std::string const&, std::list<octave_value_list, std::allocator<octave_value_list> > const&, int) (ov-builtin.cc:46)
==330==    by 0x469F628: octave_value::subsref(std::string const&, std::list<octave_value_list, std::allocator<octave_value_list> > const&, int) (ov.cc:1201)
==330==    by 0x469F715: octave_value::subsref(std::string const&, std::list<octave_value_list, std::allocator<octave_value_list> > const&, int, std::list<octave_lvalue, std::allocator<octave_lvalue> > const*) (ov.cc:1212)
==330==  Address 0x8a2541c is 4 bytes inside a block of size 84 free'd
==330==    at 0x4024851: operator delete(void*) (vg_replace_malloc.c:387)
==330==    by 0x5E72FE4: Fl_Menu_Bar::~Fl_Menu_Bar() (in /usr/lib/libfltk.so.1.1)
==330==    by 0x7F7C5F1: plot_window::~plot_window() (__init_fltk__.cc:614)
==330==    by 0x7F811E9: fltk_graphics_toolkit::finalize(graphics_object const&) (__init_fltk__.cc:1572)
==330==    by 0x4335EE6: gh_manager::do_free(graphics_handle const&) (graphics.h:1945)
==330==    by 0x4336A91: F__go_delete__(octave_value_list const&, int) (graphics.h:10193)
==330==    by 0x45B8F28: octave_builtin::do_multi_index_op(int, octave_value_list const&, std::list<octave_lvalue, std::allocator<octave_lvalue> > const*) (ov-builtin.cc:128)
==330==    by 0x45B7EDE: octave_builtin::subsref(std::string const&, std::list<octave_value_list, std::allocator<octave_value_list> > const&, int, std::list<octave_lvalue, std::allocator<octave_lvalue> > const*) (ov-builtin.cc:63)
==330==    by 0x45B8CE5: octave_builtin::subsref(std::string const&, std::list<octave_value_list, std::allocator<octave_value_list> > const&, int) (ov-builtin.cc:46)
==330==    by 0x469F628: octave_value::subsref(std::string const&, std::list<octave_value_list, std::allocator<octave_value_list> > const&, int) (ov.cc:1201)
==330==    by 0x469F715: octave_value::subsref(std::string const&, std::list<octave_value_list, std::allocator<octave_value_list> > const&, int, std::list<octave_lvalue, std::allocator<octave_lvalue> > const*) (ov.cc:1212)
==330==    by 0x4744E6C: tree_index_expression::rvalue(int, std::list<octave_lvalue, std::allocator<octave_lvalue> > const*) (pt-idx.cc:407)
==330== 

==330== 
==330== HEAP SUMMARY:
==330==     in use at exit: 38,324,539 bytes in 12,891 blocks
==330==   total heap usage: 679,899 allocs, 667,008 frees, 95,046,270 bytes allocated
==330== 
==330== LEAK SUMMARY:
==330==    definitely lost: 7,388 bytes in 154 blocks
==330==    indirectly lost: 88,768 bytes in 514 blocks
==330==      possibly lost: 862,121 bytes in 7,341 blocks
==330==    still reachable: 37,366,262 bytes in 4,882 blocks
==330==         suppressed: 0 bytes in 0 blocks
==330== Rerun with --leak-check=full to see details of leaked memory
==330== 
==330== For counts of detected and suppressed errors, rerun with: -v
==330== ERROR SUMMARY: 3 errors from 1 contexts (suppressed: 149 from 12)