How can I suppress or change the error message 'Undefined function or variable'

Question

StevieNewRoad 2013-10-23

0
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https://ww2.mathworks.cn/matlabcentral/answers/91205-how-can-i-suppress-or-change-the-error-message-undefined-function-or-variable

编辑： Vivek Selvam 2013-10-23

I am using the user request ‘input’ function to gather some data which is all supposed to be numeric. Obviously if the user enters a letter Matlab throws up the above error due to a data type clash:

Please enter a number: t
    Error using input
    Undefined function or variable 't'.
    Error in finaltest (line 5)
    number= input('Please enter a number:
    ');
    Please enter a number:

I would like to suppress this error or, even better, change it to one of my own.

I have tried to find the error identifier, but to no avail:

EDU>> lasterror
ans = 
         message: [1x135 char]
      identifier: [1x24 char]
           stack: [1x1 struct]

Is it even possible to change this error?

Thanks in advance

Steve

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Answer 1

Vivek Selvam 2013-10-23

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/91205-how-can-i-suppress-or-change-the-error-message-undefined-function-or-variable#answer_100601

编辑：Vivek Selvam 2013-10-23

在 MATLAB Online 中打开

You can try this:

number = '';
  % str2double returns NaN if input is not a real or complex scalar value
while isnan(str2double(number))
    number= input('Please enter a number: ','s'); % get input as string
end
disp(['You entered ' number]);
number = str2double(number);