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  • $\begingroup$ About how long does it take to generate the contour? Even with PlotPoints -> 100 deleted, I still am waiting for a result. $\endgroup$ Commented Dec 20, 2014 at 17:24
  • $\begingroup$ Hello, @bbgodfrey. Thank you again! In this code, I use Contours -> 20 rather than specifying any value to my function, so it take about 50s in my common PC to generate the contour even PlotPoints -> 100. Please feel free to test it :). $\endgroup$ Commented Dec 21, 2014 at 2:22
  • $\begingroup$ My PC took almost 90 sec just to create the 1D plot below. Is it possible that we have different versions of the data.mx file? Very strange. By the way, feel free to contact me by email, if you wish. [email protected] $\endgroup$ Commented Dec 21, 2014 at 3:18
  • $\begingroup$ The data file is fairly large and I'm on a slow connection, so forgive me for asking, but does the file contain the original data array or just the InterpolatingFunction? As bbgodfrey's answer shows, the oscillations are inherent in the InterpolatingFunction, and it's quite possible that adjusting the parameters of Interpolation could solve the problem, but to do that we would need the original data. $\endgroup$ Commented Dec 21, 2014 at 3:51
  • $\begingroup$ @bbgodfrey, Thank you Dr. Godfrey :). I will contact you properly! The data should be same. Please try my ContourPlot in the original post, I have checked OP with the data link again, it takes 51.79 seconds to generate the contour line. My machine: i5-3470 CPU@ 3.2 GHz, RAM 4G, MMA9.0. $\endgroup$ Commented Dec 21, 2014 at 4:19