How to use variables in a subsystem mask

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Dani Tormo 2013-6-17

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https://ww2.mathworks.cn/matlabcentral/answers/79330-how-to-use-variables-in-a-subsystem-mask

评论： Zoe Xiao 2017-8-2

Hi!

I am working on a subsystem mask that changes its outputs depending on a popup. The thing is that I have to know which was the previous popup item selected to do one change or another.

I am doing it by using one parameter of the mask. It works when it is shown in the mask ( show parameter checked), but when I hide it (I don't want to see this variable) it stop working properly.

Is there any way to use variables instead of parameters to do that?

Many thanks!

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Dani Tormo 2013-6-24

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Yes, it returns the new value, when I need to know the previous one. For this reason I need to use another parameter to store which was the previous pop-up value and at the end of the callback I store the new value. The parameter where I store the previous value shouldn't be modifiable by the mask. This is the code by the way, topology is the pop-up parameter and previous_topology is where I save the previous pop-up value:

 % Pop-up callback
 previous_topology = get_param(gcb,'previous_topology');
 if strcmp(get_param(gcb,'topology'),'Num. 1')
    switch previous_topology
        case '2'
            % Execute changes when coming from Topology 2...
        case '3'
            % Execute changes when coming from Topology 3...
    end
    set_param(gcb,'previous_topology','1');
 elseif strcmp(get_param(gcb,'topology'),'Num. 2')
    switch previous_topology
        case '1'
            % Execute changes when coming from Topology 1...
        case '3'
            % Execute changes when coming from Topology 3...
    end
    set_param(gcb,'previous_topology','2');
 elseif strcmp(get_param(gcb,'topology'),'Num. 3')
    switch previous_topology
        case '1'
            % Execute changes when coming from Topology 1...  
        case '2'
            % Execute changes when coming from Topology 2...
    end
    set_param(gcb,'previous_topology','3');
 end