Contourf: fill inside instead of outside
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Hi, how can I fill the area within the circle? At the moment Matlab fills the area outside. I would like the outside to be white and the inside to be filled. Thanks.
relamdt=-4:0.1:4;
imlamdt=-4:0.1:4;
[x,y]=meshgrid(relamdt,imlamdt);
axis square;
lamdt=x+i*y;
sig = (1 + lamdt);
v = [1,1];
contourf(x,y,abs(sig),v)
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採用された回答
Walter Roberson
2019 年 4 月 8 日
編集済み: Walter Roberson
2019 年 4 月 8 日
contourf(x, y, -abs(sig), -v)
Alternately, possibly
[~,h] = contourf(x, y, abs(sig), v);
drawnow(); %seems to be needed to get NodeChildren created
bg = h.NodeChildren(2).ColorData;
h.NodeChildren(2).ColorData = uint8([255; 255; 255; 255]);
ax = ancestor(h,'axes');
ax.Color = bg;
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その他の回答 (2 件)
David Wilson
2019 年 4 月 8 日
A quick hack (following the essence of your code) is
cmap = colormap; cmap(end,:) = [1,1,1]; colormap(cmap);
contourf(x,y,abs(sig),[0,1]);
axis square
Roberto Tumolo
約22時間 前
What if one wants to extract the values shown inside and outside (suppose you don't know them because they come from a contour?
1 件のコメント
DGM
約22時間 前
The way the question is posed makes it unclear what information we might have. From a contour()/contourf() object, we can know a set of discrete z-values associated with the given level curves, but unless we have access to the original zdata, we don't know the actual values between the level curves. If we don't have access to the object itself (e.g. if all we have is a saved figure as a raster image (a screenshot)), then things get more restricted.
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