How do I plot the nearest neighbour algorithm in a matrix?

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Riah Wilkinson
Riah Wilkinson 2017-3-18
评论： Walter Roberson 2017-3-27
Hi,
X = [0 0 0 0 0; 0 0 1 0 0; 0 0 0 0 1]
I would like to produce a coloured grid that displays the matrix elements equal to one as red. Yellow for the elements at a neighbourhood of 8 connectivity to the non-zero elements and green for the elements further away from 1.
Should I be using brute force or knnsearch or is there a better/ faster way to go about it?
Thanks
  1 个评论
Walter Roberson
Walter Roberson 2017-3-27
.... Then don't use that code.
You have forgotten that chessboard distance does not stop at distance 1 or 2.

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采纳的回答

Walter Roberson
Walter Roberson 2017-3-18
编辑：Walter Roberson 2017-3-18
d = bwdist(X);
t = ones(size(X));
t(d < 1.5) = 3;
t(d == 0) = 2;
cmap = [0 1 0;
1 0 0;
1 1 0];
image(t);
axis image
colormap(cmap)

更多回答（1 个）

Chad Greene
Chad Greene 2017-3-18
How about bwlabel? Then you can use imagesc to display the matrix and set the colormap to red, yellow, and green by
colormap([0.9 0 0;1 1 0.08; 0.08 0.69 0.1])

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