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

Question

Paolo Binetti 2017-3-4

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https://ww2.mathworks.cn/matlabcentral/answers/328062-how-to-reshape-two-cell-arrays-of-strings-into-a-cell-array-of-cell-arrays

评论： Star Strider 2017-3-4

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

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Answer 1

Star Strider 2017-3-4

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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)';

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Paolo Binetti 2017-3-4

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

Star Strider 2017-3-4

My pleasure!

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Answer 2

John BG 2017-3-4

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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