How to change a simscape block parameter from MATLAB app?

There is a block for selecting the refrigerants (Two-Phase Fluid Predefined Properties (2P)). Its a simscape block. How to change the refrigerant in this block without double clicking it? I use matlab app to run the model. In the same way I need to change the refrigerant for my model using app.

Answer 1

[Arjun]

Hi @Vangala,

I see that you have a Simscape block, and you want to tweak its properties using MATLAB code.

You can do so by using the “set_param” function by providing the exact path to your block, the property or parameter name you want to modify and the value that you want to assign.

To determine the path of a block, open the mode and click on the desired block. Then, execute the command “gcb” in the command line to obtain the block's path. To find the modifiable parameters, use “get_param”, which will return all parameters that can be adjusted.

Kindly refer to the code snippet below:

% get list of all the parameters that can be modified 

get_param('Block_PATH','DialogParameters'); 

% modify the parameters 

set_param('Block_PATH','Parameter_Name',values); 

Kindly refer the documentation of “gcb”, “get_param” and “set_param”:

• gcb:https://www.mathworks.com/help/simulink/slref/gcb.html
• get_param:https://www.mathworks.com/help/simulink/slref/get_param.html
• set_param: https://www.mathworks.com/help/simulink/slref/set_param.html

I hope this will help!

Answer 2

[Yifeng Tang]

modelname = "myModel";  % CHANGE THIS
refrigerant = "R134a";  % CHANGE THIS. 
% You may use any of the following refrigerant names in R2024b
% "Ammonia","CarbonDioxide","Isobutane","Propane"
% "R1233zdE","R1234yf","R134a","R22","R32","R404A","R407C","R410A"

props_block =  modelname + "/Two-Phase Fluid Predefined Properties (2P)";
set_param(props_block,"fluid","fluids.two_phase_fluid.utilities.enum.Fluid."+refrigerant);