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Can this be improved? Rot13 Encode & Decode

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Jake Wright
Jake Wright 2019-10-17
编辑： Rik 2019-10-21
Hello,
Im a new student studying computer science and we have recently started learning Matlab. (2-3 Weeks so still very novice!)
I was given a task of creating two scripts to both encode and decode the rot13 cypher. I believe I have completed them but just wanted to see if you guys can spot any
rookie mistakes or any improvements you would make? Thanks for any help!
Encode :
function [ciphermessage] = rot13_encode(plainmessage)
ciphermessage = plainmessage + 13;
for i=1:length(ciphermessage)
if(ciphermessage(i)>90)
ciphermessage(i) = ciphermessage(i) - 26;
end
end
ciphermessage = char(ciphermessage);
end
Decode:
function [ciphermessage] = rot13_encode(plainmessage)
ciphermessage = plainmessage - 13;
for i=1:length(ciphermessage)
if(ciphermessage(i) < 65)
ciphermessage(i) = ciphermessage(i) + 26;
end
end
ciphermessage = char(ciphermessage);
end

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回答（1 个）

Sid Singh
Sid Singh 2019-10-21
Hi, you should rename your decoding function, it is very misleading.
Instead of using the for loop, you can use logical indexing to make it more MATLAB like.
idx = ciphermessage>90;
ciphermessage(idx) = ciphermessage(idx) - 26;
Also your code doesn't work for lowercase ASCII. Maybe you can improve it to support this as well.

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