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

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

Answer 1

[Image Analyst]

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

[Star Strider]

‘A man a plan a canal Panama’

[Image Analyst]

Uh, yeah, good point. Cast the string to lower case with lower() before proceeding.

[Star Strider]

That’s my all time fave!

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

[Image Analyst]

True.

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

Answer 2

[sesha sai]

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

[Walter Roberson]

The typecasts are mostly not needed in the code.

Answer 3

[Benjamin Askelund]

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

[Walter Roberson]

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

[Steven Lord]

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.

Answer 4

[Bhuvana Krishnaraj]

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

[Walter Roberson]

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.