how to make value a double scalar in appdesigner in matlab

You can make a value a double scalar by first assigning it as a double and then making sure it is not an array. Here's an example code snippet to demonstrate this in AppDesigner:

main.m
% Assuming you have a property called 'myValue' that you want to set as a double scalar
app.myValue = double(5); % Assigning a double value

if ~isscalar(app.myValue)
    % If it is not a scalar, then modify it to be a scalar
    app.myValue = double(app.myValue(1));
end
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In this code snippet, myValue is assigned a double value of 5, and then a check is performed to ensure it is a scalar. If it is not a scalar, it is modified to be a scalar using indexing.