<p>I'm writing some data acquisition software and need a gui plotting library that is fast enough to do realtime updated graphs.  I've been using Nplot which is pretty good for a free library, but I'm wondering if there are any better libraries (preferably free or cheap).</p>

[{'answer_id': 5745, 'author': 'Vaibhav', 'author_id': 380, 'author_profile': 'https://Stackoverflow.com/users/380', 'pm_score': 2, 'selected': False, 'text': '<p>Well, not free. But we have had very good results with Nevron. Their support is excellent as well.</p>\n\n<p>Another good option is TeeCharts.</p>\n'}, {'answer_id': 5771, 'author': 'jfs', 'author_id': 718, 'author_profile': 'https://Stackoverflow.com/users/718', 'pm_score': 3, 'selected': True, 'text': '<p>There\'s a good post about this <a href="http://weblogs.asp.net/gbarnett/archive/2008/06/03/visualising-data.aspx" rel="nofollow noreferrer">here</a> and <a href="http://weblogs.asp.net/gbarnett/archive/2008/03/23/free-graphing-libraries-for-net-my-thoughts.aspx" rel="nofollow noreferrer">here</a>. I have also used NPlot in our last project since it\'s easier to use.</p>\n'}, {'answer_id': 5776, 'author': 'GateKiller', 'author_id': 383, 'author_profile': 'https://Stackoverflow.com/users/383', 'pm_score': 1, 'selected': False, 'text': '<p>You might want to take a look at <a href="http://teethgrinder.co.uk/open-flash-chart/" rel="nofollow noreferrer">Open Flash Chart</a>. It\'s an open source graphing tool built in flash and can be dynamically updated.</p>\n\n<p>Check out the <a href="http://teethgrinder.co.uk/open-flash-chart/gallery-js-2.php" rel="nofollow noreferrer">Ajax example</a> for an idea of what it can do.</p>\n'}, {'answer_id': 5785, 'author': 'John Downey', 'author_id': 200, 'author_profile': 'https://Stackoverflow.com/users/200', 'pm_score': 2, 'selected': False, 'text': '<p>If you need something to display in a WinForms app then you can try out the free <a href="http://zedgraph.org/wiki/index.php?title=Main_Page" rel="noreferrer">ZedGraph</a>. If it is ASP.NET then I recently have used <a href="http://code.google.com/apis/chart/" rel="noreferrer">Google Charts</a> with some great results.</p>\n'}, {'answer_id': 43816, 'author': 'nickd', 'author_id': 2373, 'author_profile': 'https://Stackoverflow.com/users/2373', 'pm_score': 2, 'selected': False, 'text': "<p>ZedGraph is not WinForms only, there's a web control too. It's very good.</p>\n"}, {'answer_id': 235096, 'author': 'Enrico', 'author_id': 30507, 'author_profile': 'https://Stackoverflow.com/users/30507', 'pm_score': 2, 'selected': False, 'text': "<p>Definetly go for Zedgraph, we have been using this for years and it is very good in 'real-time' graphing. Zedgraph is very well documented and there are many examples available.</p>\n"}, {'answer_id': 1052596, 'author': 'Gaurav', 'author_id': 129769, 'author_profile': 'https://Stackoverflow.com/users/129769', 'pm_score': 2, 'selected': False, 'text': '<p>If speed is your main concern, nothing better than TeeChart. The fastLine series it provides plots 10 million points in a second. And recently they have introduced it for realtime as well. I was blown away by the speed of plotting.</p>\n'}]
['https://Stackoverflow.com/questions/5743', 'https://Stackoverflow.com', 'https://Stackoverflow.com/users/327/']