Making a group of maximum nearest elements.
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If I have some points and a data. I need to find the all the nearest elements of points. How can I do that ? Please help me.
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Guillaume
2020-3-12
Be aware that the following creates a temporary matrix of size numel(A) x numel(B), so if both vectors are very large you may run out of memory:
%for row vectors:
%example data
A = [1,4,2,6,9,0,4.2,5.6];
B = [0.1,4.1,3];
assert(isrow(A) && isrow(B), 'Inputs must be row vectors');
[~, groupA] = min(abs(A - B.'), [], 1)
%for column vectors:
%demo data
A = A.'; B = B.';
assert(iscolumn(A) && iscolumn(B), 'Inputs must be column vectors')
[~, groupA] = min(abs(A.' - B), [], 1)
I'm not sure how this should be applied to your example datasheet. Looking at what it contains, you should import that excel file in a table, in which case you should store the group as another variable of the table so you can then use aggregation functions such as groupsummary.
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Guillaume
2020-3-17
As I've said, this is typically a bad idea. I was asking about what you want to do after that. It is very likely that whatever it is, it will be much easier if you don't do this.
Now if you really insist:
group = accumarray(a(:), groupnumber(:), [], @(v) {v});
or
group = splitapply(@(v) {v}, a(:), groupnumber(:));
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