How to make two numeric field related in GUI?

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Mohamed Elasmar
Mohamed Elasmar 2019 年 9 月 16 日
回答済み: Ned 2019 年 9 月 20 日
It is the first time for me to use MATLAB GUI and I am trying to make a relation between two numeric field componets, so that if I put a number in the first numeric field and press "Enter", a specific value will be shown in the other numeric field according to an equation that I have.
Could someone please help me to do this?

回答 (2 件)

Johannes Fischer
Johannes Fischer 2019 年 9 月 16 日
The 'Callback' property of the uicontrol defines which function to call when you press enter while the edit field is in focus. A small example:
function minimalUI
figure('Position', [300 300 500 150])
editA = uicontrol('style', 'edit', ...
'Position', [100 50 100 50], ...
'Callback', {@cbA});
editB = uicontrol('style', 'edit', ...
'Position', [300 50 100 50], ...
'Callback', {@cbB});
function cbA(src, evtData)
set(editB, 'String', get(src, 'String'));
function cbB(src, evtData)
set(editA, 'String', get(src, 'String'));
Your callback function always needs two input arguments, the first is the handle to the calling object and the second tells you something about what happend. That means you must always define your callback functions with at least tqo input arguments, whether you need them or not.
  4 件のコメント
Mohamed Elasmar
Mohamed Elasmar 2019 年 9 月 17 日
編集済み: Mohamed Elasmar 2019 年 9 月 17 日
Actually, I am using App Designer and I am trying to change the callbacks in the same way of your guide, but it seems that they are fixed and cannot be changed.
Are you using App Designer also?
I am sorry if do not understand well what you explains, but as I said that I am using MATLAB GUI for the first time and I am not familiar with all its functions and Syntax.
Rik 2019 年 9 月 17 日
This page should help. AppDesigner works similar to a class, while this example code has a more functional syntax.


Ned 2019 年 9 月 20 日
Assuming the numeric fields are EditFieldA and EditFieldB, and you want FieldB to display double the value of FieldA,
make this the value changed function for EditFieldA
value = app.EditFieldA.Value
app.EditFieldB.Value = 2 * value;


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