Suppressing ans in a function

Question

Omer Acil 2020-5-23

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/531223-suppressing-ans-in-a-function

评论： Omer Acil 2020-5-23

function encStr = encrypt(s,key);
prompt='Enter message to be encrypted: ';
s=input(prompt,'s');
key=input('Enter the key: ');
encStr=char(s+key);
fprintf('The encrypted message is: %s\n',encStr);
end

Hi this is my function above. I don't want to see an ans when I apply this function. I searched it online but most of the answers says that I should get rid of encStr in the function but I must use this format. Can you help me?

Thanks!

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Answer 1

Stephen23 2020-5-23

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https://ww2.mathworks.cn/matlabcentral/answers/531223-suppressing-ans-in-a-function#answer_437048

编辑：Stephen23 2020-5-23

在 MATLAB Online 中打开

To avoid the ans you must use a semi-colon when you call the function:

str = encrypt(...);
%                 ^ you need this semicolon!

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Stephen23 2020-5-23

编辑：Stephen23 2020-5-23

在 MATLAB Online 中打开

"...user may not know that he/she should use semi-colon to suppress it"

Because all variable assignments and function outputs are displayed by default, one of the first things that beginners learn about MATLAB is how to suppress those using a semi-colon.

It is certainly possible to define the function to return no output argument when no output is requested, e.g.:

function out = encrypt(...)
...
if nargout>0
    out = encStr;
end
end

but as soon as the user assigns the output to a variable they will need to use a semi-colon to supress displaying it. That is just how MATLAB works. I would recommend that you do NOT mess around with output arguments, as this just results in less predictable function behavior (ultimately your users just have to learn how MATLAB works).

Omer Acil 2020-5-23