how to combine strings that are generated inside a function?

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Roxanne Esguerra
Roxanne Esguerra 2020-7-22
评论： Roxanne Esguerra 2020-7-23
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!

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采纳的回答

KSSV
KSSV 2020-7-22
function scrambled = royalscramble(str)
exchange = randperm(length(str));
scrambled = str(exchange) ;
end
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Stephen23
Stephen23 2020-7-22
"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
Roxanne Esguerra 2020-7-23
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 :)

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