How can I use selections from multiple uidropdowns as function inputs?

Question

Riley 2024-7-8

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https://ww2.mathworks.cn/matlabcentral/answers/2135586-how-can-i-use-selections-from-multiple-uidropdowns-as-function-inputs

回答： Voss 2024-7-8

I'm using two (2) uidropdowns with a valuechangedfcn to live update the x-y axes for a plot based on the selected variable. I can't figure out how to simultaneously pass the information from both dropdowns to my plotting function. For example, say I have data for three variables: time, position, and velocity, and I have two drop downs each containing the same three variables for the x and y axes. I'm unable to retain a previous variable selection for the x-axis once I select a new variable for the y-axis, so it just reverts to the initialized x-variable. Is there a way to store the selection from each dropdown simultaneously

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Answer 1

Walter Roberson 2024-7-8

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https://ww2.mathworks.cn/matlabcentral/answers/2135586-how-can-i-use-selections-from-multiple-uidropdowns-as-function-inputs#answer_1482981

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Inside the plotting function, access the uidropdown value property directly for the two controls.

xval = app.XDropDown.Value;
yval = app.YDropDown.Value;

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Answer 2

Voss 2024-7-8

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https://ww2.mathworks.cn/matlabcentral/answers/2135586-how-can-i-use-selections-from-multiple-uidropdowns-as-function-inputs#answer_1482986

在 MATLAB Online 中打开

Here's an example of how it could work:

function uidropdown_demo()
T = array2table([(1:25).' [10 100].*rand(25,2)], ...
    'VariableNames',{'time','position','velocity'});
f = uifigure();
ax = uiaxes(f, ...
    'Position',[20 20 400 300]);
xdd = uidropdown(f, ...
    'Items',T.Properties.VariableNames, ...
    'Position',[20 340 100 26], ...
    'ValueChangedFcn',@vcf);
ydd = uidropdown(f, ...
    'Items',T.Properties.VariableNames, ...
    'Position',[220 340 100 26], ...
    'ValueChangedFcn',@vcf);
vcf() % initialize the plot
    function vcf(~,~)
        plotFunction(xdd.Value,ydd.Value)
    end
    function plotFunction(x,y)
        cla(ax)
        plot(ax,T.(x),T.(y));
        xlabel(ax,x);
        ylabel(ax,y);
    end
end