Find all possible combinations of string array
显示 更早的评论
Hi,
i have a struct that contains cells of different dimensions. I need a way to find all possible combinations of all cells.
The cells containing string variable e.g: matrix(1).elements = {'500A', '600B', '700C',''}, matrix(2).elements = {'100AC', '300D', '200CA','60G'}, matrix(3).elements = {'100BC', '300DF', '200AA','60GR'}...(some cells have less variables and for this reason i have " at the last element of matrix(1))
The total number of combinations in the example above is: 4*4*4=64
The results that i would like is a mat like: 1) 500A,100AC, 100BC,
2) 500A,100AC, 300DF
3) 500A,100AC, 200AA...
I tried allcomb function but it doesn't work
Any idea on that?
Thanks in advance
采纳的回答
Here are two options.
a = {'a','b','c','d'};
b = {'qq','rrr','ss'};
c = {'tuv','xyz'};
m = combvec(1:numel(a), 1:numel(b), 1:numel(c))
combStr = [a(m(1,:)); b(m(2,:)); c(m(3,:))]'
Use ndgrid, no toolboxes needed
[ai,bi,ci] = ndgrid(1:numel(a), 1:numel(b), 1:numel(c));
m = [ai(:),bi(:),ci(:)]'
combStr2 = [a(m(1,:)); b(m(2,:)); c(m(3,:))]'
Compare results
isequal(combStr, combStr2)
Use ndgrid with a variable number of vectors / cell arrays
% Concatenate all cell arrays into a since
% cell array of cells (data in this example).
a = {'a','b','c','d'};
b = {'qq','rrr','ss'};
c = {'tuv','xyz'};
d = {'1','2','3','4','5'};
data = {a,b,c,d}
% Combine all nested cell arrays in 'data'.
indices = cellfun(@(c){1:numel(c)},data);
ndg = cell(size(data));
[ndg{:}] = ndgrid(indices{:});
combStrCellArray = cellfun(@(str,ind){str(ind)},data,ndg);
combStrCell = cellfun(@(c){c(:)}, combStrCellArray);
combStr = horzcat(combStrCell{:})'
4 个评论
Christos Traianos
2021-12-9
Christos Traianos
2021-12-9
Christos Traianos
2021-12-9
Adam Danz
2021-12-9
I've updated my answer. See the addendum at the bottom.
更多回答（1 个）
David Hill
2021-12-7
编辑：David Hill
2021-12-7
You could get all possible combinations and then index into your struct.
[idxa,idxb,idxc]=ndgrid(1:5,1:3,1:7);
类别
在 帮助中心 和 File Exchange 中查找有关 Matrices and Arrays 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
