Traping Error user input

Question

Rooy 2012-4-13

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/35344-traping-error-user-input

n=inputdlg('Please input a number more than or equal one:')

I would like to trap the user if they input anything other than numbers more than 1. I have tried loop,isnumeric but they all don't work overally.

Any ideas?

Thank you

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Answer 1

Honglei Chen 2012-4-13

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/35344-traping-error-user-input#answer_44288

在 MATLAB Online 中打开

Is this what you want?

n=inputdlg('Please input a number more than or equal one:')
while isempty(str2num(n{1})) || str2num(n{1})<1
  n=inputdlg('Please input a number more than or equal one:')
end

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Rooy 2012-4-14

What if I have more than one input

for instance

n=inputdlg({'Please input a number more than or equal one:';'P'})

while isempty(str2num(n{1})) || str2num(n{1})<1 || isempty(str2num(n{2})) || str2num(n{2})<1

h = errordlg;

waitfor(h)

n=inputdlg({'Please input a number more than or equal one:';'P'})

end

I can't just keep hard coding the loops based on the the amount of inputs. Is there another way

Honglei Chen 2012-4-15

n=inputdlg({'Please input a number more than or equal one:';'P'})

while any(cellfun(@isempty,cellfun(@str2num,n,'UniformOutput',false))) || ...

any(cellfun(@lt,cellfun(@str2num,n,'UniformOutput',false),...

num2cell(ones(numel(n),1))))

h = errordlg;

waitfor(h)

n=inputdlg({'Please input a number more than or equal one:';'P'})

end

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Answer 2

Image Analyst 2012-4-13

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/35344-traping-error-user-input#answer_44290

在 MATLAB Online 中打开

Try this:

clc;    % Clear the command window.
workspace;  % Make sure the workspace panel is showing.
fontSize = 20;
format compact;
% Initialize flag to keep going or not.
keepGoing = true;
userPrompt = 'Enter a number greater than 1';
defaultValue = 42;
while keepGoing
  % Ask user for a number.
  caUserInput = inputdlg(userPrompt, 'Enter the number',1,{num2str(defaultValue)});
  usersValue = round(str2double(cell2mat(caUserInput)));
  % Check for a valid integer.
  if isnan(usersValue)
    % They didn't enter a number.  
    % They clicked Cancel, or entered a character, symbols, or something else not allowed.
    break;
  end
  % See if it's > 1
  if usersValue > 1
    message = sprintf('Success!\n you entered %f.\n', usersValue);
    keepGoing = false; % Bail out
  else
    message = sprintf('Try again.  You entered %f.\n%s', ...
      usersValue, userPrompt);    
    % Keep going.
  end
  uiwait(msgbox(message));
end

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Image Analyst 2012-4-14

It does not stall. It works fine. I just copied it and ran it again. I was able to enter lots of numbers less than 1 and it kept reprompting the user to enter a number >1. When I finally did enter a number > 1, it exited the while loop. It does exactly what you asked for. If it doesn't, then you must have altered it and broken it.

Rooy 2012-4-17