Combine matrixes with like same values

Question

Conner Carriere 2022-11-11

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1848958-combine-matrixes-with-like-same-values

评论： Conner Carriere 2022-11-21

采纳的回答： Jan

在 MATLAB Online 中打开

I know this has been asked before, but im just not sure how to approach it.

I have a cell that looks

bbox
[0,241,637,168]
[204,181,382,286]
[56,314,185,243]
[0,59,574,506]
[8,58,230,546]

and another "key" cell that looks like this

I also have a cell that called "class"

I need an output like this

row   bbox                                 class
 [0,241,637,168; 204,181,382,286]       [5;11]
 [56,314,185,243; 0,59,574,506]         [12;9]
 [8,58,230,546]                         [10]

Any info would help, I am sure that it uses either the unique() or accumarray() function

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Answer 1

Jan 2022-11-11

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1848958-combine-matrixes-with-like-same-values#answer_1097578

编辑：Jan 2022-11-11

在 MATLAB Online 中打开

bbox = {[0,241,637,168]; ...
        [204,181,382,286]; ...
        [56,314,185,243]; ...
        [0,59,574,506]; ...
        [8,58,230,546]};
key = [1, 1, 2, 2, 3];
result = splitapply(@(c) {cat(1, c{:})}, bbox, key(:))
result = 3×1 cell array
    {2×4 double    }
    {2×4 double    }
    {[8 58 230 546]}

Another option is a simple loop:

ukey   = unique(key);
result = cell(numel(ukey), 1);
for k = 1:numel(ukey)
    result{k} = cat(1, bbox{key == ukey(k)});
end
result
result = 1×3 cell array
    {2×4 double}    {2×4 double}    {[8 58 230 546]}

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Conner Carriere 2022-11-21

What would with that simple loop if I wanted to add another set of numbers to it. This one would be tied to the bounding box. Wherever the bounding box moves, the value would be "tied" to it and relocate to where it does. I changed the question to match

Conner Carriere 2022-11-21