# [?]  Avoid crooked line in $\log(\frac{a+1}{c+1})$ contour plot?

Posted 2 years ago
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 I plotted contour plot of this formula by Wolfram Alpha $$\log(\frac{a+1}{c+1}), 0 < a < 1000, 0 < c < 1000$$ In the above figure, there is a crooked line in the bottom part. If I plot this, there is no crooked line. $$\log(\frac{a}{c}), 0 < a < 1000, 0 < c < 1000$$ Why there is crooked line in the first case?
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Posted 2 years ago
 HiWolfram Alfa uses a standard options to display ContourPlots. Maybe it's related to performance and display timeIn Mathematica we have to controls on all options. ContourPlot[Log[(a + 1)/(c + 1)], {a, 0, 1000}, {c, 0, 1000}, FrameLabel -> Automatic](*Automatic option like WolframAlfa*) PlotPoint option is to get smoother contours. ContourPlot[Log[(a + 1)/(c + 1)], {a, 0, 1000}, {c, 0, 1000}, FrameLabel -> Automatic, PlotPoints -> 100](*And here we need more CPU time*) Regards, Mariusz.