How to create a permutation table on Matlab?

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hang dong
hang dong 2019-5-14
评论： hang dong 2019-5-15
Hello every one. My name is Hang.
I'm working on a graduation project, I have a little bit of hope for people to help me.
I want to create a table containing all permutations of a string of n elements, a table to index each permutation of that string. everyone help me. Thanks everyone!
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hang dong
hang dong 2019-5-14
What function do you use to list permutations of a string of n elements?
Steven Lord
Steven Lord 2019-5-14
How large a value of n are you planning to use? As the documentation states, the perms function is practical only for small vectors as the resulting matrix is of size [factorial(n), n] and that grows pretty quickly. Your matrix will have over three million rows for n = 10 and over six billion for n = 13.

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回答（1 个）

KSSV
KSSV 2019-5-14
编辑：KSSV 2019-5-15
Read about perms.
str = 'MATLAB' ;
id = 1:length(str) ; % indices
ids = perms(id) ; % permuted indices
iwant = str(ids) ; % permuted string
pos = (1:length(iwant))' ;
T = table(pos,iwant) ; % convers to table
writetable(T,'test.xlsx') % write table to file
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Guillaume
Guillaume 2019-5-14
"I want ..."
Yes, so what's preventing you from doing that very trivial modification to KSSV's code? If you don't know how to construct a table, perhaps you should learn this from the documentation. If you don't know how to construct a vector of integers, perhaps you should learn to use matlab first.

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