Insert an element once in a listbox

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Samah EL QASSAH
Samah EL QASSAH 2017-11-27
评论： KL 2017-11-27
I wrote the following code that allows me to insert the word "Cab1" in a list once the condition is true
if (Output == 1)
str = get(handles.list_Update, 'string');
str = cellstr(str);
str{end+1} = 'Cab1';
set(handles.list_Update, 'String', str);
end
But I get the result below because the condition "Output = 1" is still true. I want to insert the word "Cab1" only once in the list even if Output remains at 1. Can a Brake help me to solve the problem otherwise how to do it?

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回答（1 个）

KL
KL 2017-11-27
Check if your string already existing in your listbox and make output false in that case?
Something like,
if (Output == 1)
str = get(handles.list_Update, 'string');
str = cellstr(str);
if find(ismember(str, 'cab1'))
output = 0;
else
str{end+1} = 'Cab1';
set(handles.list_Update, 'String', str);
end
end
  2 个评论
Samah EL QASSAH
Samah EL QASSAH 2017-11-27
Thanks KL for the help, yes, but I don't want to set the "Output" to 0
KL
KL 2017-11-27
If you don't want to set the output to be zero, you can do nothing under the true case and simply return to your main routine.

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