如何防止輸入對話框在matlab中關閉？

Question

如何避免輸入對話框直接由用戶關閉而不輸入任何值？對於「菜單」功能，我們可以使用選項== 0來選擇未選擇的選項，但輸入對話框怎麼樣？

prompt = {'Enter gain：'，'Enter range：'};

dlg_title ='輸入值';

num_lines = 1;

def = {'20'，'256'}; ％默認

答案= inputdlg（提示，dlg_title，NUM_LINES，DEF）;

%%%獲得兩個輸入值%%%%

％A = getfield命令（回答，{1}）; ％第一輸入字段

A = str2double（回答{1}）;

％B = getfield（answer，{2}）; ％第二個輸入字段

B = str2double（answer {2}）;

假設我有一個輸入對話框，如圖，我怎麼可以把它用在完整地循環

Answer 1

不能防止它被封閉的模式，但你可以使用一個while循環重新打開它，直到用戶已經輸入了有用的值。

done = false; 
while ~done 
    a=inputdlg('enter a number') 
    num = str2double(a{1}); %# will turn empty and strings into NaN 
    if isnumeric(num) 
     done = true; 
    else 
     %# keep running while loop 
     %# you can pop up an errordlg box here to tell the user what was wrong. 
     %# It would be nice if you were to set the inputs that passed the test 
     %# as defaults for the next call of inputdlg. Nothing sucks as much 
     %# as having to completely re-fill a form because of a small typo 
    end 
end