Using inputdlg and isnan

16 次查看（过去 30 天）
Gregory Hind
Gregory Hind 2020-5-2
评论： Gregory Hind 2020-5-2
I need a user input using inputdlg, I need it to be a number and I need it to keep assking until I get a number. So far, it just gets stuck in a loop.
Please help, this should be easy!
nof=inputdlg('Enter number of floors:');
NOF=str2double(nof);
while isempty(NOF)||isnan(NOF)
disp('error')
nof=inputdlg('Enter number of floors:');
uiwait;
end

请先登录，再回答此问题。

采纳的回答

Tommy
Tommy 2020-5-2
In your code, NOF never changes inside the loop. Therefore, if the loop enters, it won't ever exit because the exit condition will never be true. Make sure you are calling str2double within the loop:
res=inputdlg('Enter number of floors:');
nof=str2double(res);
while isempty(res) || isnan(nof)
% ^ user canceled ^ input was not numeric
disp('error')
res=inputdlg('Enter number of floors:');
nof=str2double(res);
end
If you want to let the user use the command line:
opts.WindowStyle = 'normal';
res=inputdlg('Enter number of floors:', '', 1, {''}, opts);
nof=str2double(res);
while isempty(res) || isnan(nof)
disp('error')
res=inputdlg('Enter number of floors:', '', 1, {''}, opts);
nof=str2double(res);
end

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Data Type Conversion 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by