How to extract every elements with different dimension at multiple cells in efficient manner?

Dear all,

Say I have three cells, where the element

dd = [49;50;51;52;53;54]  [55;56;57]  [85;86;87;88;89;90]

The objective is to extract all the element in each cell and make it into single row, such that

[40 50 51 52 53 54 55 56 57 85 86 87 88 89 90]

I used the following lines.

C =1
for i =1:size(dd,2)
 Xcx = cell2mat (dd (1,i));
 ee =[]
ee (1,1: length (Xcx))  =Xcx;
for k =1: length (ee )
  new (C,1) = ee (k)
C =C+1
end
end

Even though the code do the trick, I am looking if there is more advance and compact ways of doing it?

Thanks in advance

Answer 1

[balandong]

Dear Akira, Thanks for your response, I give an idea of using the VERTCAT. Using VERTCAT instead of HORZCAT skip the need of CELLFUN and TRANSPOSE.

dd = {[49;50;51;52;53;54], [55;56;57], [85;86;87;88;89;90]};
output1 =vertcat (dd{:});

Thanks for your answer, however I had to accept this solution as a better and more compact ways.

Answer 2

[Sanjay Nair]

Hello,

If I'm understanding your problem correctly you have a cell array that can be defined in the following manner

dd = {[49;50;51;52;53;54], [55;56;57], [85;86;87;88;89;90]};

Since you have a cell array of column vectors with only three elements, perhaps the easiest way to extract them into a single row vector would be to transpose and concatenate the contents in a single command as follows:

row = [dd{1}', dd{2}', dd{3}'];

You can get more information about accessing data in cell-arrays in: https://www.mathworks.com/help/matlab/matlab_prog/access-data-in-a-cell-array.html

[balandong]

HI Sanjay, Thanks for your response and idea. Your suggestion maybe effecient for few cell arrays. However, I want to generalize the code so that it can handle many cell array, say, > 20 cell arrays. I dont think it is a godd practice to do as following

row = [dd{1}', dd{2}', dd{3}', dd{4}', dd{5}', dd{6}', dd{7}', dd{8}', dd{9}', dd{10}', dd{11}', dd{12}', dd{13}', dd{14}', dd{15}', dd{16}', dd{17}', dd{18}', dd{19}', dd{20}'];

Answer 3

[Akira Agata]

How about using cellfun and horzcat functions as follows. In this code, each element in cell array dd is transposed by cellfun. Next, horzcat concatenate each element horizontally.

dd = {[49;50;51;52;53;54], [55;56;57], [85;86;87;88;89;90]};

ddTrans = cellfun(@transpose,dd,'UniformOutput',false);
Output = horzcat(ddTrans{:});

[balandong]

HI Akira, I really appreciate the time and idea you provide. Your suggestion work like a charm. Thank you