Combine matrixes with like same values

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

1
1
2
2
3

I also have a cell that called "class"

5
11
12
9
10

I need an output like this

row   bbox                                 class
1   [0,241,637,168; 204,181,382,286]       [5;11]
2   [56,314,185,243; 0,59,574,506]         [12;9]
3   [8,58,230,546]                         [10]

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

Answer 1

[Jan]

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]}

[Conner Carriere]

Thank you for this, but what would I do if for some reason there is a 0 in the grp matrix?

This is beacuse I have an instance of 1, 2, 3, no 4's, 5, 6, no 7, 8 9

[Conner Carriere]

That simple loop worked well for me! thank you!

[Jan]

"This is beacuse I have an instance of 1, 2, 3, no 4's, 5, 6, no 7, 8 9" - It is easier to write an answer, if you post the input data in a form, which can be used by copy&paste.

I'm glad, if the loop method solves the problem.

[Conner Carriere]

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]

realized I can run the function twice and combine them... Its late