How to write a function to scramble letters?

Question

computing6 2015-4-28

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回答： Emil Latypov 2020-4-2

How would I create a function called 'wordScramble', which will randomly scramble letters in a word. The function accepts as an input a string of any length and returns a string with the same length as the input string, but with the characters randomly scrambled.

For example, if I input wordScramble('Hello') and it returned ans= l o e l H

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Answer 1

Joseph Cheng 2015-4-28

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编辑：Joseph Cheng 2015-4-28

You can use the function randperm() to generate a random permutation of the indexes. so then you would use the random permutation to reorder the string array

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Joseph Cheng 2015-4-28

编辑：Joseph Cheng 2015-4-28

在 MATLAB Online 中打开

Okay so... I'll only provide an outline so your function would look something like this.

 function scrambled = wordScramble(Oword)
   totNum = total number of letters using functions like length() or size();
   while totNum does not equal 0 
       randindex = random number from 1 to totNum;
       %using the randindex to add the letter to scrambled.
       %using randindex remove that index from Oword.
       totNum = totNum-1
   end

While this is one way to do it there are multiple ways to accomplish the scrambling using basic Matlab calls. Maybe use rand and loops to perform a mixing like the shell game aka Thimblerig.

I'm not sure if it is the best way but one method is to write out an outline, like i have above, of what you're trying to accomplish.

Image Analyst 2015-4-29

I would ask your instructor explicitly if you are, or are not, allowed to use other functions that you've learned about on your own outside of class.

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Answer 2

Image Analyst 2015-4-29

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编辑：Image Analyst 2015-4-29

在 MATLAB Online 中打开

Well, try this:

string = 'abcdefghijklmnopqrstuvwxyz'
scrambledString = [];
while length(string) > 0
  % Get a random location in string.
  index = randi(length(string), 1);
  % Append that to scrambledString.
  scrambledString = [scrambledString, string(index)];
  % Remove that letter from string.
  string(index) = [];
end
% Show in the command window.
scrambledString

In the command window:

string =
abcdefghijklmnopqrstuvwxyz
scrambledString =
fcjknpbhwaytorgqzmselvuidx

Hopefully I didn't just do the entire homework question for you or you'd be plagiarizing. If it was homework, you were supposed to add the "homework" tag to it up below your question but I didn't see that.

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computing6 2015-4-29

It's not homework! These are practice questions to work through to review for our final, so it's nothing I will be receiving credit for

Thank you!!

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Answer 3

Emil Latypov 2020-4-2

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https://ww2.mathworks.cn/matlabcentral/answers/214055-how-to-write-a-function-to-scramble-letters#answer_423660

在 MATLAB Online 中打开

word = 'fantastic'
newword = wordscramble(word)
function newword = wordscramble(word)
  if isempty(word)
     newword = '';
  else
     len = length(word);
     k = randi(len);
     ch = word(k);
     word(k) = [];
     newword = [ch wordscramble(word)];
  end
end