How to add constant line in appdesigner

Question

Daniel Boateng 2019-5-24

0
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https://ww2.mathworks.cn/matlabcentral/answers/463822-how-to-add-constant-line-in-appdesigner

编辑： Kojiro Saito 2019-5-24

I want to add a constant line in the plot axes in appdesigner. I tried the command plot(app.UIAxes,xline(app.DCValueDropDown.Value)) where the drop down values are values from (10 to 20). But it isnt working. Any ideas please?

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Answer 1

Kojiro Saito 2019-5-24

2
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https://ww2.mathworks.cn/matlabcentral/answers/463822-how-to-add-constant-line-in-appdesigner#answer_376482

编辑：Kojiro Saito 2019-5-24

在 MATLAB Online 中打开

Data type of dropdown.Value is a character, so you need to covert it to number.

The following will work. Please replace "plot" command depending on your data.

function startupFcn(app)
    plot(app.UIAxes, 1:20, 1:20)
    app.xl = xline(app.UIAxes, str2double(app.DCValueDropDown.Value));
end

function DCValueDropDownValueChanged(app, event)
    value = app.DCValueDropDown.Value;
    % Change xline value
    app.xl.Value = str2double(value);
end

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