How do you write a matlab function that identifies if a string is a palindrome or not?

Question

Madeleine 2014-3-30

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编辑： Walter Roberson 2024-1-10

So far I've got ...

string = input('What is your number: '); disp(fliplr(string))
if string == fliplr(string) disp('Your number is a PALINDROME') else disp('Your number is NOT A PALINDROME') end

And now I'm stuck

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Answer 1

Image Analyst 2014-3-30

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在 MATLAB Online 中打开

Almost. Try this:

string = input('What is your string: ', 's');
fprintf('Your string = %s\nFlipped, it = %s\n', string, fliplr(string));
if string == fliplr(string)
  disp('Your number is a PALINDROME')
else
  disp('Your number is NOT A PALINDROME')
end

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Star Strider 2014-3-30

That’s my all time fave!

Probably need to remove all blanks as well before flipping and doing the comparison.

Image Analyst 2014-3-30

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True.

string = lower(string);
string(string == ' ') = '';

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Answer 2

sesha sai 2020-9-26

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function [ palindromic ] = palindrome( string )
    if length(string) < 1
        palindromic = logical(1);
        return;
    end
    if string(1) ~= string(length(string))
        palindromic = logical(0);
        return;
    end
palindromic = palindrome(string(2:length(string)-1));
 end

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Walter Roberson 2020-9-26

The typecasts are mostly not needed in the code.

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Answer 3

Benjamin Askelund 2016-10-19

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编辑：Benjamin Askelund 2016-10-19

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Hi, I made a code that flipps as well NOT USING fliplr based on "Image Analyst" code. Lots of people ask for this as far as I know

clc
%Ask user for string
A = input('What is your string: ', 's');
%flipp string
B = flip(A);
 fprintf('Your word = %s\nflipped word is = %s\n', A, B);
 %compare stringA and FlippedString (bool)
  if strcmp(A, B) == 1
     disp('Your number is a PALINDROME')
  else
    disp('Your number is NOT A PALINDROME')
  end

This code also works for numbers. Just type numbers insted of strings

Sorce: https://se.mathworks.com/help/matlab/ref/flip.html

Signed BDA

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Walter Roberson 2016-10-19

fliplr(A) just calls flip(A,2)

Steven Lord 2016-10-19

Lots of people ask for this because it's a fairly easy homework assignment and so it is one that's often assigned in courses where students are being introduced to MATLAB.

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Answer 4

Bhuvana Krishnaraj 2020-1-9

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编辑：Walter Roberson 2024-1-10

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x=input('Enter number: ');
temp=x; 
y = 0;
while x > 0
    t = mod(x,10);
    y = 10*y+t;
    x = (x-t)/10;       %% without this it will give floating value
end
if(y==temp)
    disp('The number is palindrome'); 
else
    disp('The number is not palindrome'); 
end

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Walter Roberson 2020-9-26

Suppose the user enters 050. That would certainly appear to be a palindrome. You use input() with no 's' to read it so you get a binary double precision value equal to decimal 50. You proceed to process it numerically and get 10*0 + 5 = 5. But 5 is not 50 so you say No it is not a palindrome. When it should probably be one.

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