Set points that matches with a vector as NaN

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Philippe Corner
Philippe Corner 2021-8-12
评论： Philippe Corner 2021-8-17
Ran in:
load('var.mat')
scatter3(cy(:,1),cy(:,2),cy(:,3),10,'k','filled');hold on
scatter3(top(:,1),top(:,2),top(:,3),10,'r','filled');
scatter3(bot(:,1),bot(:,2),bot(:,3),10,'r','filled');
whos cy
Name Size Bytes Class Attributes cy 46057x4 1473824 double
cy is a 4 columns matrix, I would like to set all the values of cy(:,4) that matches with the positiones above top vector and below bot vector as NaN values.

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Dave B
Dave B 2021-8-12
In this particular case, because they all have the same y value, you can do this quite easily with interp:
scatter3(cy(:,1),cy(:,2),cy(:,3),10,'k','filled');hold on
scatter3(top(:,1),top(:,2),top(:,3),10,'r','filled');
scatter3(bot(:,1),bot(:,2),bot(:,3),10,'r','filled');
ind = cy(:,4) < interp1(bot(:,1),bot(:,3),cy(:,1)) | ...
cy(:,4) > interp1(top(:,1),top(:,3),cy(:,1));
cy(ind,4) = nan;
scatter3(cy(:,1),cy(:,2),cy(:,4),10,'m','filled');hold on
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Philippe Corner
Philippe Corner 2021-8-12
Thank you very much for your help. And this approah using interp1 is very interesting idea to solve this task.
Best wishes!
Philippe Corner
Philippe Corner 2021-8-17
Hi Dave, this quiestion is very similar tham this one, but im confused about how to use it for all X, Y, Z positons. If you can give a hand it would be highly appreciated! https://it.mathworks.com/matlabcentral/answers/1413272-how-to-change-the-c-values-that-matches-a-3-coordinates-position-condition

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