The meaning and function of codes on programming

Hi.

i learned a method which can ask user for a word and output a random permutation.

But professor showed a kind of method i cannot full undertand.

Here is the code.

% ask user for a word and output a random permutation

% get word

word = input("Enter a word:",'s');

% generate a permutation

permutations = perms(word); % can be used on characters

% pick a randow index

max_choice = size(permutations,1);

choice = randi([1 max_choice]);

perm = permutations(choice,:);

% output

fprintf("%s\n",perm);

what is the meaning of size(permutataions,1), and why let choice is equal to the randi([1 max_choice])

Thank you for your help

[Shuoze Xu]

sorry.

i mean what is the purpose of size(permutataions,1),i check the meaing of size() on documents.

Answer 1

[Mohammed Hamaidi]

 size(permutataions,1)

It just compute the number of ppossible permutations.

 randi([1 max_choice])

is a random choise the get a permutation

[Shuoze Xu]

I got it, thank you.