how to combine strings that are generated inside a function?

Hi, I have this code that must randomly scramble the letters of the string input and return the result as a whole word. However, this returns the letters one by one.

function royalscramble(str)
exchange = randperm(length(str));
for i=1:length(str)
    str(exchange(i))
end
end

I tried additions to the code and it worked. Here it is.

function scrambled = royalscramble(str)
exchange = randperm(length(str));
scrambled = '';
for i=1:length(str)
    scrambled = str(exchange(i));
end
end

However, the function must not be called like that. I mean, it should not have scrambled =

It should be like this and returns this kind of result:

>> royalscramble('fantastic')

ans =

safntcait

>> royalscramble ('hello')

ans =

hleol

What should I add/replace from my first code? Thanks!

Answer 1

[KSSV]

function scrambled = royalscramble(str)
exchange = randperm(length(str));
scrambled = str(exchange) ; 
end

[Roxanne Esguerra]

thanks, but I need a function that doesn't need "scrambled=" to be called... Is that possible?

[KSSV]

Use either fprintf or disp to show up the string.

[Stephen23]

"but I need a function that doesn't need "scrambled=" to be called... Is that possible?"

It is not required to call a function with an output argument:

https://www.mathworks.com/help/matlab/ref/ans.html

But if you want any value returned, you will have to declar an output argument:

https://www.mathworks.com/help/matlab/ref/function.html

[Roxanne Esguerra]

Thanks! I found my mistake. I have always called the function without putting '--' in the string. That's why it didn't work and resulted to this.

>> royalscramble(fantastic)

Unrecognized function or variable 'fantastic'.

>> scrambled = royalscramble(fantastic)

Unrecognized function or variable 'fantastic'.

Thank you so much :)