combine two double cells into 1
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Hamid Salari
el 6 de Ag. de 2017
Comentada: dpb
el 7 de Ag. de 2017
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 .
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Star Strider
el 6 de Ag. de 2017
Editada: Star Strider
el 6 de Ag. de 2017
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
el 6 de Ag. de 2017
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.
3 comentarios
dpb
el 7 de Ag. de 2017
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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