How to use set_param -function with step block in simulink?

Hello,

I´ve been using set_param -function with my simulations during the last days. However, now I can´t somehow use it with my step-function in order to set a new "final value" for the step-block between several simulations. Below you can see how I´ve defined the settings for the step-function:

As you can see, the Step-function is named as "Ref" and the parameter, that I would like to change between several simulations is named "reference".

Below you can see the top view of my simulink model:

In my matlab script I try to change the "reference" value inside the step-function as follows:

When the software comes to the "set_param" point, I get this error message:

Step block does not have a parameter named 'reference'

The set_param -function has worked several times for me, but now there´s a problem with step-function. What is wrong in my simulations?

Thank you for any kind of help!

[Azzi Abdelmalek]

Instead of posting an image, please post your code.

Answer 1

[Azzi Abdelmalek]

Why do you think Reference is a parameter in a step bock. Like you see the parameters are

1. Step time
2. Initial value
3. Final value
4. Sample time
5. ...

Even with those parameters you can't use set_param, to get the appropriate names of those parameters you can use

get_param('filename/Ref','dialogparameters')

ans =

              Time: [1x1 struct]
            Before: [1x1 struct]
             After: [1x1 struct]
        SampleTime: [1x1 struct]
    VectorParams1D: [1x1 struct]
         ZeroCross: [1x1 struct]

For your case

set_param('filname/Ref','after', num2str(step_value))

[Walter Roberson]

Zimam Amer Muhamad commented:

to check the parameter of block

Answer 2

[Nam nguyen]

how to set_param final clock block simulink?

[Arun Kumar Kantheti]

If you are looking to set stop time then you may use:

tfin = 10;
model = 'model1';
open_system(model);
set_param(model,'StopTime', num2str(tfin));

Moreover, if you ever want to know the parameters associated with any block you may use:

get_param([model '/Gain1'],'dialogparameters')

The above line would provide all the parameters of the gain block named 'Gain1' in the simulink model named 'model'