Error with "input" function

Question

lucie 2022-10-21

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1832323-error-with-input-function

评论： lucie 2022-10-27

Hello,

I am writing a quite simple code with MATLAB R2012b for an experiment and one of the first thing I want to do is to register the code of my 2 participants.

To do so, I wrote

>> codeA = input('Code of the first participant: ', 's');
>> codeB = input('Code of the second participant: ', 's');

When I run the code, it effectively asks me to enter the participant's code, but when I try to register this code, it gives me the following error (if 'x' was a participant's code) :

Undefined function or variable 'x'.

Do you have an idea of what could cause this kind of error in this case? It surprises me as it is one of the first lines of my code and as it is not a complex function.

Thanks,

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Jan 2022-10-21

Please post the complete error message, this means all of the red text. What does this mean: "but when I try to register this code"?

Are you sure that you run this code?

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Matt 2022-10-21

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1832323-error-with-input-function#answer_1080613

编辑：Matt 2022-10-21

在 MATLAB Online 中打开

The function

codeA = input('Code of the first participant: ', 's');

creates a string variable in your environnement called codeA. So if you type this function and input 'x' as an answer there are no variable x creater : only a variable of name codeA that is a string with codeA = 'x';

% try this :
codeA = input('Code of the first participant: ', 's');
%type x in your keyboard
x
% you will see an error. Now try 
codeA = input('Code of the first participant: ', 's');
% type x in your keyboard 
codeA
% you should see 'x' printed