MATLAB: Merging two arrays’s

arraysmerging

Hi,

So I have two arrays, say:

A={[1,2,3];[4,5];[]} 
B={[6];[7,8,9];[10]}

and I would like to merge them to give:

C={[1,2,3,6];[4,5,7,8,9];[10]}

Is there a nice vectorised way to do this, or do I need to resort to for loops? (I will be calling this function >100000 times so quicker the better)/

Ideally I would like to ensure no value appears twice in the same row, i.e.: {[1,2,1];…} would not be allowed, however {[1,2];[1];..} would be allowed. However I could miss this part out if it would significantly slow down the code.

Best Answer

cellfun(@horzcat,A,B,'UniformOutput',false)

If you want to ensure uniqueness, wrap a unique around the horzcat

cellfun(@(x,y)unique([x,y]),A,B,'UniformOutput',false)

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Would this work?

 >> buffer = arrayfun(@(rId) data(rId,order(rId,:)).', 1:size(order,1), ...
                      'UniformOutput', false) ;
 >> reordered_data = [buffer{:}].'
 reordered_data = 
    'B'    'B'    'B'    'B'    'B'    'A'    'A'    'B'
    'B'    'B'    'A'    'B'    'A'    'A'    'A'    'A'
    'A'    'A'    'B'    'A'    'A'    'B'    'B'    'B'
    'A'    'A'    'A'    'A'    'B'    'A'    'A'    'A'

MATLAB: How to find unique lines in cell arrays

use unique function

Best Answer

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