combine two double cells into 1

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Hamid Salari
Hamid Salari 2017-8-6
评论： dpb 2017-8-7
i have two Double[] cells with size of 1*n; every element is has some numbers in it . like :
C1{1} = [1 2 3 4]
C2{1} = [5 2 3 7]
.
.
.
C1{n} = [1 2]
C2{n} = [4 5]
how can i have a cell like this :
C{1} = [1 2 3 4 5 7]
.
.
.
C{n} = [1 2 4 5]
i`m totally new to matlab and sorry if its already been answered , but i search a lot and couldn`t find the answer .
  2 个评论
Stephen23
Stephen23 2017-8-6
编辑：Stephen23 2017-8-6
"two Double[] cells"
A cell array is NOT a double array (but can contain double arrays).
Hamid Salari
Hamid Salari 2017-8-6
@Stephen thanks . i didn`t know that .

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采纳的回答

Stephen23
Stephen23 2017-8-6
编辑：Stephen23 2017-8-6
>> C1{1} = [1,2,3,4];
>> C2{1} = [5,2,3,7];
>> C1{2} = [1,2];
>> C2{2} = [4,5];
>> Z = cellfun(@(a,b)unique([a,b]),C1,C2,'uni',0);
>> Z{:}
ans =
1 2 3 4 5 7
ans =
1 2 4 5

更多回答（3 个）

Jan
Jan 2017-8-6
编辑：Jan 2017-8-6
If you are in doubt, start with a loop:
C1 = {[1 2 3 4], [1 2]};
C2 = {[5 2 3 7], [4 5]};
C = cell(size(C1));
for iC = 1:numel(C)
C{iC} = unique([C1{iC}, C2{iC}]);
end
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Jan
Jan 2017-8-6
Thanks, Stephen. I hit the Submit button too early.

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Star Strider
Star Strider 2017-8-6
编辑：Star Strider 2017-8-6
This works, and should work with your entire ‘C1’ and ‘C2’:
C1{1} = [1 2 3 4];
C1{2} = [1 2];
C2{1} = [5 2 3 7];
C2{2} = [4 5];
C3 = cellfun(@union, C1, C2, 'Uni',0);
C3{1} % Display Result
C3{2} % Display Result
ans =
1 2 3 4 5 7
ans =
1 2 4 5
EDIT — Added output (the ‘ans’ variables).
dpb
dpb 2017-8-6
That's a little towards the advanced-beginner side... :)
>> C=cellfun(@(c1,c2) unique([c1 c2]),C1,C2,'uniform',0);
>> C{:}
C =
1 2 3 4 5 7
C =
1 2 4 5
>>
The @ symbol is defining an "anonymous function", with two arguments; cellfun passes the content of its two cell array arguments to the defined function cell-by-cell and unique does what it sounds like which is to return the unique values in its argument; the [] simply concatenate the two vectors.
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Jan
Jan 2017-8-7
Anonymous functions are very handy, but tend to be slow e.g. in cellfun.
dpb
dpb 2017-8-7
Note Star S's use of UNION over UNIQUE, though...saves a step of the concatenation.
I've never done specific timing; where the syntax is easy I'll write the CELLFUN solution as above and only if it turns out to be a bottleneck worry about what generally would be small differences in run time. Then again, I'm not actively consulting any longer so don't in general ever have large datasets where it would ever be an issue so "caveat emptor" reigneth, methinks. Keep Jan's note in mind if you're still waiting next week for the prompt to come back... :)

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