How to reshape two cell arrays of strings into a cell array of cell arrays

Is there a neat way to vectorize the for-loop below?

n_nodes = 2^(20-1);

nodes = cellstr(dec2bin(0:n_nodes-1))';

suffixes = [nodes nodes];

row1 = suffixes(:,1:2:end);
row2 = suffixes(:,2:2:end);

edges = cell(1,n_nodes);
for i = 1:n_nodes
    edges(i) = {[row1(i) row2(i)]};
end

Answer 1

[Star Strider]

I did not time this with respect to your loop, so I don’t know if it’s faster:

edges = mat2cell([row1' row2'], ones(1,size(row1,2)), 2);

This creates a column vector of cells. Transpose it if you want a row vector of cells:

edges = mat2cell([row1' row2'], ones(1,size(row1,2)), 2)';

[Paolo Binetti]

I timed it and it's 15x faster. Thank you.

[Star Strider]

My pleasure!

Answer 2

[John BG]

Hi Paolo

the following has the same size and type as the result of your for loop

    A=reshape({row1{:} row2{:}},2,8);B=A'

B
 = 
    '000'    '010'
    '100'    '110'
    '000'    '010'
    '100'    '110'
    '001'    '011'
    '101'    '111'
    '001'    '011'
    '101'    '111'
whos('B')
Name      Size            Bytes  Class    Attributes

B         8x2              1888  cell

if you find this answer useful would you please be so kind to mark my answer as Accepted Answer?

To any other reader, please if you find this answer of any help solving your question,

please click on the thumbs-up vote link,

thanks in advance

John BG

<mailto:[e-mail] [e-mail]>

[Paolo Binetti]

Hi John, thank you but I am not getting the same result.