How to concatenate string vectors of unequal length?

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If I have thee vectors v1 = {'a' 'b' 'c'}', v2 = {'d'}' and v3 = {'e' 'f'}', how do I create a four vector v4 =
'a' 'd' 'e'
'b' '' 'f'
'c' '' ''
?
  1 Comment
Stephen23
Stephen23 on 21 Dec 2014
Edited: Stephen23 on 2 Jan 2015
Actually this is concatenating cell arrays of unequal lengths... the fact that these contain strings is totally irrelevant to both the question and the answer. The title should be "How to concatenate cell vectors of unequal length?"

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Accepted Answer

Image Analyst
Image Analyst on 20 Dec 2014
Try this:
% Define component cell arrays.
v1 = {'a'; 'b'; 'c'}
v2 = {'d'}
v3 = {'e'; 'f'}
% Find out how big cell array needs to be.
lv1 = length(v1);
lv2 = length(v2);
lv3 = length(v3);
rows = max([lv1,lv2,lv3])
% Instatiate cell array of the max size.
v4 = cell(rows, 3)
% stuff each column in.
v4(1:lv1, 1) = v1;
v4(1:lv2, 2) = v2;
v4(1:lv3, 3) = v3;
% Print out results
fprintf('\n\nHere is the output cell array:\n');
v4
In the command window:
Here is the output cell array:
v4 =
'a' 'd' 'e'
'b' [] 'f'
'c' [] []

More Answers (3)

Azzi Abdelmalek
Azzi Abdelmalek on 20 Dec 2014
v1 = {'a' 'b' 'c'}',
v2 = {'d'}'
v3 = {'e' 'f'}'
v=cell(3,3)
v(:,:)={' '}
v(1:3,1)=v1
v(1,2)=v2
v(1:2,3)=v3

Thorsten
Thorsten on 20 Dec 2014
v1 = {'a' 'b' 'c'}';
v2 = {'d'}';
v3 = {'e' 'f'}';
m = max([numel(v1) numel(v2) numel(v3)]);
if numel(v1) < m, v1{m} = []; end
if numel(v2) < m, v2{m} = []; end
if numel(v3) < m, v3{m} = []; end
M = [v1 v2' v3]';
X = M(:);

Shoaibur Rahman
Shoaibur Rahman on 20 Dec 2014
Edited: Shoaibur Rahman on 20 Dec 2014
v1 = {'a' 'b' 'c'}';
v2 = {'d'}';
v3 = {'e' 'f'}';
Lv1 = length(v1); Lv2 = length(v2); Lv3 = length(v3);
n = max([Lv1 Lv2 Lv3]);
v1cell = [v1; cell(n-Lv1,1)];
v2cell = [v2; cell(n-Lv2,1)];
v3cell = [v3; cell(n-Lv3,1)];
v4 = [v1cell v2cell v3cell];

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