Smooth edge on contour plot

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Lars Peters
Lars Peters 2020-6-15
评论： Adam Danz 2020-6-15
Hello,
In my contourf plot, I want to cut off values above a certain limit, 61 in this case. In the attached figure, I want to have the figure on the right to look like the figure on the left upto the 61 line. However if I set these values to either zero or nan, the edge will always be tapered. Is there a way display the edge like a smooth contour line, like all others in the figure?
Thanks in advance!
The figure on the left is created by
figure()
contourf(W_chh*10^6,W_ww*10^6,(Twout'))
colorbar
The figure on the right is created by
figure()
Twout(Twout >= 61) = nan;
contourf(W_chh*10^6,W_ww*10^6,(Twout'))
colorbar
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Lars Peters
Lars Peters 2020-6-15
The same questions holds for this figure, I don't know the values in this case, just the matrix index of the part that needs to be cut off, which I did. Maybe this clears the confusion.
Adam Danz
Adam Danz 2020-6-15
My updated answer suggests to plot the contour lines without modifying the inputs. Then, after the contrours are plotted, remove the levels greater than your threshold.

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采纳的回答

Adam Danz
Adam Danz 2020-6-15
编辑：Adam Danz 2020-6-15
See the 'levels' option. You could get the levels from the first controur plot and use the same levels for the 2nd plot.
contourf(___,levels)
Also see caxis() to control the color limits so that they match between the two axes.
[update]
Alternatively, you could produce the controur plot without the levels input and then, after plotting, remove levels greater than 61.
[~, c] = contourf(W_chh*10^6,W_ww*10^6,(Twout'));
c.LevelList(c.LevelList > 61) = [];
Then add white to the very end of your color map and set the color range so the max values are white.
ax = gca();
ax.Colormap(end,:) = 1; % Max color is now white
A potentially ugly approach would be to get the coordinates of the jagged controur line, smooth them, then replot the smoothed line.
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Lars Peters
Lars Peters 2020-6-15
编辑：Lars Peters 2020-6-15
Thank You!

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