How to convert a struct into a bus

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Nicolò Binda 2020-4-22

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/519927-how-to-convert-a-struct-into-a-bus

编辑： Christian 2024-1-9

采纳的回答： Daniel Luder

I need to create a bus for simulink, and to avoid to do it manually i generated a struct usingi different for cycles

Now i have a struct that conains simple values and other struct.

es=

car.id=1

car.engine.pistons.compression_ring.maintenance_time

car.engine.pistons.compression_ring.maintenance_cost

car.engine.pistons.oil_control_ring

car.engine.bearings

car.body.door

ecc...

Now i need to trasform this struct into a bus object but i really can't find how

I find a lot of solution on matlab like:

struct2bus and others like Simulink.Bus.cellToObject(busCell) without any luck

or also this one:

https://it.mathworks.com/matlabcentral/answers/98993-how-do-i-create-a-bus-object-from-a-struct-in-my-workspace-using-simulink-7-4-r2009b

thanks

采纳的回答

Daniel Luder 2020-4-22

4
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/519927-how-to-convert-a-struct-into-a-bus#answer_427731

在 MATLAB Online 中打开

I use the function Simulink.Bus.createObject(struct)

For your problem use the following lines:

% Create Model Struct
car.id = 1;
car.engine.pistons.compression_ring.maintenance_time = 2;
car.engine.pistons.compression_ring.maintenance_cost = 3;
car.engine.pistons.oil_control_ring = 4;
car.engine.bearings = 5;
car.body.door = 6;
% Create Estimation Data Bus for Simulink Model
car_bus_info = Simulink.Bus.createObject(car);
car_bus = evalin('base', car_bus_info.busName);

In Simulink use a constant block and define the constant value as car. Under Signal Attributes --> Output data dype define Bus: car_bus.

I hope that solves your problem

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Daniel Luder 2020-4-24

在 MATLAB Online 中打开

a) I assume it is because the bus objects from the base workspace are linked to the Simulink model. You can find the corresponding bus objects in the Bus Editor as shown below.

b) I think because of a). As workaround I clear all variables of type Simulink.Bus from my base workspace before I call Simulink.Bus.createObject. Below you will find an example implemented as a function.

car_bus = createSimulinkBus(car);
function my_bus = createSimulinkBus(my_struct)
    % Clear all Variables from base Workspace of Class Type 'Simulink.Bus'
    S = evalin('base', 'whos');
    workspace_vars_names = {S.name};
    idx_bus_vars = strcmp({S.class}, 'Simulink.Bus');
    if max(idx_bus_vars)
        evalin('base',['clear' sprintf(' %s', workspace_vars_names{idx_bus_vars})]);
    end
    % Create Bus Object for Simulink Model
    my_bus_info = Simulink.Bus.createObject(my_struct);
    my_bus = evalin('base', my_bus_info.busName);
    
    % Clear the automatic generated 'slBus1' Bus Object
    vars = {'slBus1'};
    evalin('base',['clear' sprintf(' %s',vars{:})]);
end

Martin Ryba 2023-8-7

Hi Nicolo, the way you can populate it is by using a Constant block to feed your structure into a port with that bus definition (at least that worked for me). I put similar code to define and populate the struct, and invoke the Simulink.Bus.createObject into a initialization script that is the PostLoadFcn callback of the top level model.

Christian 2024-1-9

编辑：Christian 2024-1-9

Great solution, thank you.

You have to be careful, it does not work if the struct contains char. Matlab fails to provide a proper error message.

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