Excluding NaN from Convhull calculation

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William Sheehan 2018-7-29

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回答： Image Analyst 2018-7-29

Is there any way to carry out the 'convhull' function without removing NaN from the data. I know I could just remove a whole column or row that contains NaN but I would rather not do that. Is there any way around this ?

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Answer 1

Image Analyst 2018-7-29

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Just use isnan() to remove points with a nan in them. Why not? That's how everyone would do it. Why not you? What's the reluctance to do that???

nanRows = any(isnan(xy), 2);  % xy is N rows by 2 columns.
xy(nanRows, :) = [];
vertexIndices = convhull(xy(:, 1), xy(:, 2));
xHull = xy(vertexIndices, 1);
yHull = xy(vertexIndices, 2);