Appdesigner, knob value

Question

Furkan Karaman 2023-2-20

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1915695-appdesigner-knob-value

编辑： Voss 2023-2-20

Hello,

I have an oscilloscope-App in which I want to use 2 knobs , if I switch the knob a value to a variable should be assigned. And this value should be used in a function if a button is then pressed.

That works with one knob but not with the other. I have absolutely no idea why that is.

Does anyone have a clue?

from the appdesigner code:

function EdgeKnobValueChanged(app, event)
value = app.EdgeKnob.Value;
if strcmp(value,'rising')
    app.Edge=2;
    
end
if strcmp(value,'falling')
    app.Edge=1;
end
end
% Value changed function: CouplingKnob
function CouplingKnobValueChanged(app, event)
value = app.CouplingKnob.Value;
if strcmp(value,'AC')
    app.AC=1;
    app.DC=0;
end
if strcmp(value,'DC')
    app.DC=1;
    app.AC=0;
end            
end
function StartButtonPushed(app, event)
if strcmp(app.Trigger,'Simple edge')
    somefunction(app.Edge);  %the value for app.Edge cant be used in the function 
end
end

I would be really grateful for any kind of help.

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Answer 1

Voss 2023-2-20

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1915695-appdesigner-knob-value#answer_1175700

编辑：Voss 2023-2-20

在 MATLAB Online 中打开

uiknob 'Value' is a numeric (https://www.mathworks.com/help/matlab/ref/matlab.ui.control.knob-properties.html), so both strcmp calls return false, so app.Edge is not set.

value = 3; % some numeric value
strcmp(value,'rising')
ans = logical
   0
strcmp(value,'falling')
ans = logical
   0

Regardless of that, you should initialize app.Edge, app.AC, and app.DC in your startupFcn to be the values corresponding to their repective knobs, in case the user clicks the start button without interacting with the knobs.